LMB Limbach Holdings Inc

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Basis of Presentation

References in these financial statements to the Company refer collectively to the accounts of Limbach Holdings, Inc. and its wholly-owned subsidiaries, including LHLLC, Limbach Facility Services LLC (“LFS”), Limbach Company LLC (“LC LLC”), Limbach Company LP, Harper Limbach LLC, Harper Limbach Construction LLC, Limbach Facility & Project Solutions LLC, Jake Marshall, LLC (“JMLLC”) and Coating Solutions, LLC (“CSLLC”) for all periods presented. All intercompany balances and transactions have been eliminated.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the requirements of Form 10-Q and Rule 8-03 of Regulation S-X for smaller reporting companies. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. Readers of this report should refer to the consolidated financial statements and the notes thereto included in the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on March 8, 2023.

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements for assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, the reported amounts of revenue and expenses during the reported period, and the accompanying notes. Management believes that its most significant estimates and assumptions have been based on reasonable and supportable assumptions and the resulting estimates are reasonable for use in the preparation of the condensed consolidated financial statements. The Company’s significant estimates include estimates associated with revenue recognition on construction contracts, costs incurred through each balance sheet date, intangibles, property and equipment, fair value accounting for acquisitions, insurance reserves, fair value of contingent consideration arrangements and contingencies. If the underlying estimates and assumptions upon which the condensed consolidated financial statements are based change in the future, actual amounts may differ from those included in the accompanying condensed consolidated financial statements.

Unaudited Interim Financial Information

The accompanying interim Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Stockholders’ Equity and Condensed Consolidated Statements of Cash Flows for the

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periods presented are unaudited. Also, within the notes to the condensed consolidated financial statements, the Company has included unaudited information for these interim periods. These unaudited interim condensed consolidated financial statements have been prepared in accordance with GAAP. In the Company's opinion, the accompanying unaudited condensed consolidated financial statements contain all normal and recurring adjustments necessary for a fair statement of the Company’s financial position as of June 30, 2023, its results of operations and equity for the three and six months ended June 30, 2023 and 2022 and its cash flows for the six months ended June 30, 2023 and 2022. The results for the three and six months ended June 30, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023.

The Condensed Consolidated Balance Sheet as of December 31, 2022 was derived from the Company's audited financial statements included in its Annual Report on Form 10-K filed with the SEC on March 8, 2023, but is presented as condensed and does not contain all of the footnote disclosures from the annual financial statements.

Recently Adopted Accounting Standards

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial instruments, including trade receivables and off-balance sheet credit exposure. Under this guidance, an entity is required to consider a broader range of information to estimate expected credit losses, which may result in earlier recognition of losses. This ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The Company adopted ASU 2016-13 on January 1, 2023 using the modified retrospective method, whereby the guidance was applied prospectively as of the date of adoption and prior periods are not restated. The adoption of this ASU did not have a material impact on the Company's financial position or results of operations.

The Company assessed the scope of its financial assets and determined that the guidance associated with ASU 2016-13 is relevant to its trade accounts receivable and contract assets, including retainage. The Company’s trade receivables include amounts from work completed in which it has billed or has an unconditional right to bill its customers. The majority of the Company’s trade receivables are contractually due in less than a year. The Company further assessed the guidance based on its segment portfolio of receivables. While the Company’s construction-type GCR and ODR financial assets are often in the same subset of customers and industries, the Company’s construction-type related project work is typically bonded and the customers to which they perform work are well-known, solvent and have no history of material receivable write-offs. On the contrary, the Company’s service-type work, in particular its ODR core service work, is smaller in nature and is usually more susceptible to customer write-offs. As such, there is greater risk of credit loss on the Company’s ODR-related service-type receivables. The Company’s contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The Company has policies and procedures in place where it reviews claims and change orders on a quarterly basis to determine legal entitlement and recoverability in accordance with ASC Topic 606. As such, the Company has determined the risk of credit loss on its contracts assets to be remote.

The Company develops its allowances for credit losses, which represent an estimate of expected losses over the remaining contractual life of its ODR-related service-type receivables, using an aging method. Under the aging method, the Company assigns its accounts receivable to a level of delinquency and applies a loss rate to each class. Loss rates are determined based on historical loss experiences with customers, the consideration of a customer’s financial condition, current market economic conditions and a forecast of future economic conditions when appropriate. When the Company becomes aware of a customer's inability to meet its financial obligation, a specific reserve is recorded to reduce the receivable to the expected amount to be collected.

As part of the Company’s analysis of expected credit losses, it may analyze receivables with customers on an individual basis in situations where such accounts receivables exhibit unique risk characteristics and are not expected to experience similar losses to the rest of their class.

Recent Accounting Pronouncements

The FASB has issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting in March 2020. This new guidance provides optional expedients for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform, on financial reporting. The risk of termination of the London Interbank Offered Rate (LIBOR), has caused regulators to undertake reference rate reform initiatives to identify alternative reference rates that are more observable or transaction based that are less susceptible to manipulation. ASU 2020-04 was effective between March 12, 2020 and December 31, 2022. However, in December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, extending the sunset date under Topic 848 from December 31, 2022 to December 31, 2024 to align the temporary accounting relief guidance with the expected LIBOR cessation date of June 30, 2023.

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In addition, in January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The amendments in this update refine the scope for certain optional expedients and exceptions for contract modifications and hedge accounting to apply to derivative contracts and certain hedging relationships affected by the discounting transition. As a result of ASU 2022-06, an entity may now elect to apply the amendments in this update from the beginning of an interim period beginning as of March 12, 2020, through December 31, 2024. The Company has evaluated the impact of adopting the reference rate reform guidance (both ASU 2020-04 and ASU 2021-01) on its consolidated financial statements and has determined that these pronouncements did not have a significant impact. As discussed in Note 5, the A&R Credit Agreement removed LIBOR as a benchmark rate and now utilizes SOFR (as defined in the A&R Credit Agreement) as its replacement. During the second quarter of 2023, the Company entered into the Second A&R Credit Agreement (as defined in Note 5), which also utilizes SOFR as a benchmark rate. In addition, the Company’s interest rate swap utilizes SOFR as its benchmark rate.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity and amends the scope guidance for contracts in an entity's own equity. The ASU addresses how convertible instruments are accounted for in the calculation of diluted earnings per share by using the if-converted method. The guidance is effective for all entities for fiscal years beginning after March 31, 2024, albeit early adoption is permitted no earlier than fiscal years beginning after December 15, 2020. Management is currently assessing the impact of this pronouncement on its condensed consolidated financial statements.

The Company generates revenue from construction type contracts, primarily consisting of fixed-price contracts, to deliver HVAC, plumbing, and electrical construction services to its customers. The duration of its contracts generally ranges from three months to two years. Revenue from fixed price contracts is recognized on the cost-to-cost method, measured by the relationship of total cost incurred to total estimated contract costs. Revenue from time and materials contracts is recognized as services are performed. The Company believes that its extensive experience in HVAC, plumbing, and electrical projects, and its internal cost review procedures during the bidding process, enable it to reasonably estimate costs and mitigate the risk of cost overruns on fixed price contracts.

The Company generally invoices customers on a monthly basis, based on a schedule of values that breaks down the contract amount into discrete billing items. Costs and estimated earnings in excess of billings on uncompleted contracts are recorded as a contract asset until billable under the contract terms. Billings in excess of costs and estimated earnings on uncompleted contracts are recorded as a contract liability until the related revenue is recognizable. The Company classifies contract assets and liabilities that may be settled beyond one year from the balance sheet date as current, consistent with the length of time of the Company’s project operating cycle.

Contract assets

Contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The components of the contract asset balances as of the respective dates were as follows:

(in thousands)			June 30, 2023						December 31, 2022						Change
Contract assets
Costs and estimated earnings in excess of billings on uncompleted contracts			$	34,006					$	33,573					$	433
Retainage receivable			25,418						27,880						(2,462)
Total contract assets			$	59,424					$	61,453					$	(2,029)

Retainage receivable represents amounts invoiced to customers where payments have been partially withheld, typically 10%, pending the completion of certain milestones, satisfaction of other contractual conditions or the completion of the project. Retainage agreements vary from project to project and balances could be outstanding for several months or years depending on a number of circumstances such as contract-specific terms, project performance and other variables that may arise as the Company makes progress towards completion.

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Contract assets represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Contract assets result when either: (1) the appropriate contract revenue amount has been recognized over time in accordance with ASC Topic 606, but a portion of the revenue recorded cannot be currently billed due to the billing terms defined in the contract, or (2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings.

The current estimated net realizable value on such items as recorded in contract assets and contract liabilities in the condensed consolidated balance sheets was $19.8 million and $28.5 million as of June 30, 2023 and December 31, 2022, respectively. The Company currently anticipates that the majority of such amounts will be approved or executed within one year. The resolution of those claims and unapproved change orders that may require litigation or other forms of dispute resolution proceedings may delay the timing of billing beyond one year.

Contract liabilities

Contract liabilities include billings in excess of contract costs and provisions for losses. The components of the contract liability balances as of the respective dates were as follows:

(in thousands)			June 30, 2023						December 31, 2022						Change
Contract liabilities
Billings in excess of costs and estimated earnings on uncompleted contracts			$	43,382					$	43,806					$	(424)
Provisions for losses			300						201						99
Total contract liabilities			$	43,682					$	44,007					$	(325)

Billings in excess of costs and estimated earnings on uncompleted contracts represent the excess of contract billings to date over the amount of contract costs and profits (or contract revenue) recognized to date. The balance may fluctuate depending on the timing of contract billings and the recognition of contract revenue.

Provisions for losses are recognized in the condensed consolidated statements of operations at the uncompleted performance obligation level for the amount of total estimated losses in the period that evidence indicates that the estimated total cost of a performance obligation exceeds its estimated total revenue.

The net (overbilling) underbilling position for contracts in process consisted of the following:

(in thousands)			June 30, 2023						December 31, 2022
Revenue earned on uncompleted contracts			$	739,788					$	678,014
Less: Billings to date			(749,164)						(688,247)
Net (overbilling) underbilling			$	(9,376)					$	(10,233)
(in thousands)			June 30, 2023						December 31, 2022
Costs in excess of billings and estimated earnings on uncompleted contracts			$	34,006					$	33,573
Billings in excess of costs and estimated earnings on uncompleted contracts			(43,382)						(43,806)
Net (overbilling) underbilling			$	(9,376)					$	(10,233)

Revisions in Contract Estimates

The Company recorded revisions in its contract estimates for certain GCR and ODR projects. During the three and six months ended June 30, 2023, the Company did not record any material gross profit write-ups or write-downs that had a net gross profit impact of $0.5 million or more. During the three and six months ended June 30, 2022, the Company recorded a material gross

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profit write-up on one GCR project for a total of $1.3 million that had a net gross profit impact of $0.5 million or more for both periods.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. The Company’s remaining performance obligations include projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions.

As of June 30, 2023, the aggregate amount of the transaction prices allocated to the remaining performance obligations of the Company's GCR and ODR segment contracts were $260.2 million and $113.6 million, respectively. The Company currently estimates that 52% and 65% of its GCR and ODR remaining performance obligations as of June 30, 2023, respectively, will be recognized as revenue during the remainder of 2023, with the substantial majority of remaining performance obligations to be recognized within 24 months, although the timing of the Company's performance is not always under its control.

Additionally, the difference between remaining performance obligations and backlog is due to the exclusion of a portion of the Company’s ODR agreements under certain contract types from the Company’s remaining performance obligations as these contracts can be canceled for convenience at any time by the Company or the customer without considerable cost incurred by the customer.

Goodwill

Goodwill was $11.4 million as of June 30, 2023 and December 31, 2022 and is entirely associated with the Company's ODR segment. The Company tests its goodwill and indefinite-lived intangible assets allocated to its reporting units for impairment annually on October 1, or more frequently if events or circumstances indicate that it is more likely than not that the fair value of its reporting units and indefinite-lived intangible assets are less than their carrying amount. The Company has the option to assess goodwill for possible impairment by performing a qualitative analysis to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessments results in a more-likely-than-not determination or if a qualitative assessment is not performed.

The Company did not recognize any impairment charges on its goodwill or intangible assets during the three and six months ended June 30, 2023 and June 30, 2022.

Intangible Assets

Intangible assets are comprised of the following:     

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(in thousands)			Gross carrying amount						Accumulated amortization						Net intangible assets, excluding goodwill
June 30, 2023
Amortized intangible assets:
Customer relationships – GCR – Jake Marshall			$	570					$	(127)					$	443
Customer relationships – ODR – Jake Marshall			3,050						(637)						2,413
Customer relationships – ODR – Limbach			4,710						(3,891)						819
Favorable leasehold interests – Limbach			190						(105)						85
Backlog – GCR – Jake Marshall			260						(260)						—
Backlog – ODR – Jake Marshall			680						(680)						—
Trade name – Jake Marshall			1,150						(295)						855
Total amortized intangible assets			10,610						(5,995)						4,615
Unamortized intangible assets:
Trade name – Limbach(1)			9,960						—						9,960
Total unamortized intangible assets			9,960						—						9,960
Total amortized and unamortized assets, excluding goodwill			$	20,570					$	(5,995)					$	14,575

(1)    The Company has determined that its trade name has an indefinite useful life. The Limbach trade name has been in existence since the Company’s founding in 1901 and therefore is an established brand within the industry.

(in thousands)			Gross carrying amount						Accumulated amortization						Net intangible assets, excluding goodwill
December 31, 2022
Amortized intangible assets:
Customer relationships – GCR – Jake Marshall			$	570					$	(87)					$	483
Customer relationships – ODR – Jake Marshall			3,050						(436)						2,614
Customer relationships – ODR – Limbach			4,710						(3,765)						945
Favorable leasehold interests – Limbach			190						(97)						93
Backlog – GCR – Jake Marshall			260						(178)						82
Backlog – ODR – Jake Marshall			680						(465)						215
Trade name – Jake Marshall			1,150						(202)						948
Total amortized intangible assets			10,610						(5,230)						5,380
Unamortized intangible assets:
Trade name – Limbach			9,960						—						9,960
Total unamortized intangible assets			9,960						—						9,960
Total amortized and unamortized assets, excluding goodwill			$	20,570					$	(5,230)					$	15,340

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(in thousands)			June 30, 2023						December 31, 2022
A&R Wintrust Term Loan - term loan payable in quarterly installments of principal, plus interest through February 2026			—						21,453
Wintrust Revolving Loans			10,000						—
Finance leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 3.96% to 8.35% through 2027			6,961						4,954
Financing liability			5,351						5,351
Total debt			22,312						31,758
Less - Current portion of long-term debt			(2,431)						(9,564)
Less - Unamortized discount and debt issuance costs			(396)						(666)
Long-term debt			$	19,485					$	21,528

Wintrust Term and Revolving Loans

On February 24, 2021, LFS, LHLLC and the direct and indirect subsidiaries of LFS from time to time included as parties to the agreement (the “Wintrust Guarantors”) entered into a credit agreement (the “Wintrust Credit Agreement”) by and among LFS, LHLLC, Wintrust Guarantors, the lenders party thereto from time to time, Wheaton Bank & Trust Company, N.A., a subsidiary of Wintrust Financial Corporation (collectively, “Wintrust”), as administrative agent and L/C issuer, Bank of the West as documentation agent, M&T Bank as syndication agent, and Wintrust as lead arranger and sole book runner.

In accordance with the terms of the Wintrust Credit Agreement, Lenders provided to LFS (i) a $30.0 million senior secured term loan (the “Wintrust Term Loan”); and (ii) a $25.0 million senior secured revolving credit facility with a $5.0 million sublimit for the issuance of letters of credit (the “Wintrust Revolving Loan” and, together with the Wintrust Term Loan, the “Wintrust Loans”). Proceeds of the Wintrust Loans were used to refinance certain existing indebtedness, finance working capital and other general corporate purposes and fund certain fees and expenses associated with the closing of the Wintrust Loans.

The Wintrust Revolving Loan initially bore interest, at LFS’s option, at either LIBOR (with a 0.25% floor) plus 3.5% or a base rate (with a 3.0% floor) plus 0.50%, subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA (earnings before interest, income taxes, depreciation and amortization) of LFS and its subsidiaries for the most recently ended four fiscal quarters. The Wintrust Term Loan initially bore interest, at LFS’s option, at either LIBOR (with a 0.25% floor) plus 4.0% or a base rate (with a 3.0% floor) plus 1.00%, subject to a 50 (for LIBOR) or 75 (for base rate) basis point step-down based on the Senior Leverage Ratio (as defined below).

LFS was initially required to make principal payments on the Wintrust Term Loan in $0.5 million installments on the last business day of each month commencing on March 31, 2021 with a final payment of all principal and interest not sooner paid on the Wintrust Term Loan due and payable on February 24, 2026.

In conjunction with the Company's acquisitions of JMLLC and CSLLC (the “Jake Marshall Transaction”), the Company entered into an amendment to the Wintrust Credit Agreement (the “A&R Wintrust Credit Agreement”). In accordance with the terms of the A&R Credit Agreement, Lenders provided to LFS (i) a $35.5 million senior secured term loan (the “A&R Wintrust Term Loan”); and (ii) a $25 million senior secured revolving credit facility with a $5 million sublimit for the issuance of letters of credit (the “A&R Wintrust Revolving Loan” and, together with the Term Loan, the “A&R Wintrust Loans”). The overall Wintrust Term Loan commitment under the A&R Wintrust Credit Agreement was recast at $35.5 million in connection with the A&R Credit Agreement. A portion of the A&R Wintrust Term Loan commitment was used to fund the closing purchase price of the Jake Marshall Transaction. The A&R Credit Agreement was also amended to: (i) permit the Company to undertake the Jake Marshall Transaction, (ii) make certain adjustments to the covenants under the A&R Credit Agreement (which were largely done to make certain adjustments for the Jake Marshall Transaction), (iii) allow for the Earnout Payments (as defined in Note 7) under the Jake Marshall Transaction, and (iv) make other corresponding changes to the A&R Credit Agreement.

The A&R Wintrust Revolving Loan bore interest, at LFS’s option, at either the Term SOFR (as defined in the A&R Credit Agreement) (with a 0.15% floor) plus 3.60%, 3.76% or 3.92% for a tenor of one month, three months or six months, respectively, or a base rate (as set forth in the A&R Credit Agreement) (with a 3.0% floor) plus 0.50%, subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA of LFS and its subsidiaries for the most recently ended four fiscal quarters (the “Senior Leverage Ratio”). The A&R Wintrust Term Loan bore interest, at LFS’s option, at either Term SOFR (with a 0.15% floor) plus 4.10%, 4.26% or 4.42% for a tenor of one month, three months or six months, respectively, or a base rate (with a 3.0% floor) plus 1.00%, subject to a 50 (for Term SOFR) or 75 (for base rate) basis point step-down based on the Senior Leverage Ratio.

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The A&R Wintrust Term Loan was payable through a combination of (i) monthly installments of approximately $0.6 million due on the last business day of each month commencing on December 31, 2021, (ii) annual Excess Cash Flow payments as defined in the A&R Wintrust Credit Agreement, which are due 120 days after the last day of the Company's fiscal year and (iii) Net Claim Proceeds from Legacy Claims as defined in the A&R Wintrust Credit Agreement. Subject to defaults and remedies under the A&R Credit Agreement, the final payment of all principal and interest not sooner paid on the A&R Wintrust Term Loan was due and payable on February 24, 2026. Subject to defaults and remedies under the A&R Credit Agreement, the A&R Wintrust Revolving Loan would have matured and become due and payable by LFS on February 24, 2026. During the second quarter of 2022, the Company made certain Excess Cash Flow and Net Claim Proceeds payments of $3.3 million and $2.1 million, respectively, which concurrently reduced the outstanding A&R Wintrust Term Loan balance. In addition, during the third quarter of 2022, the Company made a Net Claim Proceeds payment of $0.6 million, which was also applied against the outstanding A&R Wintrust Term Loan balance.

The A&R Wintrust Loans were secured by (i) a valid, perfected and enforceable lien of the administrative agent on the ownership interests held by each of LFS and Wintrust Guarantors in their respective subsidiaries; and (ii) a valid, perfected and enforceable lien of the administrative agent on each of LFS and Wintrust Guarantors’ personal property, fixtures and real estate, subject to certain exceptions and limitations. Additionally, the re-payment of the A&R Wintrust Loans shall be jointly and severally guaranteed by each Wintrust Guarantor.

The A&R Credit Agreement contained representations and warranties, covenants and events of default that are customary for facilities of this type, as more particularly described in the A&R Credit Agreement. The A&R Wintrust Loans also contain three financial maintenance covenants, including (i) a requirement to have as of the last day of each quarter for the senior leverage ratio of the Company and its subsidiaries not to exceed an amount beginning at 2.00 to 1.00, (ii) a fixed charge coverage ratio of not less than 1.20 to 1.00 as of the last day of each fiscal quarter, commencing with the fiscal quarter ending December 31, 2021, and (iii) no unfinanced capital expenditures, except for unfinanced capital expenditures in the ordinary course of business not exceeding in the aggregate $4.0 million during any fiscal year; and no default or event of default (as defined by the agreement) has occurred and is continuing, 50% of any portion of this annual limit, if not expended in the fiscal year for which it is permitted, may be carried over for expenditure in the next following fiscal year as stipulated by the agreement. LFS and its affiliates maintain various commercial and service relationships with certain members of the syndicate and their affiliates in the ordinary course of business.

On May 5, 2022, the Company, LFS and LHLLC entered into a first amendment and waiver to the A&R Wintrust Credit Agreement (the “First Amendment to the A&R Wintrust Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent. The First Amendment to the A&R Wintrust Credit Agreement modifies certain definitions within the A&R Wintrust Credit Agreement, and make other corresponding changes, including: (i) the definition of “EBITDA” to allow for the recognition of certain restructuring charges and lease breakage costs not previously specified, (ii) the definition of “Excess Cash Flow” to exclude the aggregate amount of the Earnout Payments paid in cash, (iii) the definition of “Total Funded Debt” to exclude certain capitalized lease obligations for real estate based on the approval of each lender and (iv) the definition of “Disposition” to include a clause for the sale and leaseback of certain real property based on the approval of each lender.

In July 2022, the Company entered into an interest rate swap agreement to manage the risk associated with a portion of its variable-rate long-term debt. The interest rate swap involves the exchange of fixed-rate and variable-rate payments without the exchange of the underlying notional amount on which the interest payments are calculated. The new swap agreement became effective on July 14, 2022 and will terminate on July 31, 2027. The notional amount of the swap agreement is $10.0 million with a fixed interest rate of 3.12%. If the one-month SOFR (as defined in the A&R Credit Agreement) is above the fixed rate, the counterparty pays the Company, and if the one-month SOFR is less than the fixed rate, the Company pays the counterparty, the difference between the fixed rate of 3.12% and one-month SOFR. The Company has not designated this instrument as a hedge for accounting purposes. As a result, the change in fair value of the derivative instrument is recognized directly in earnings on the Company's condensed consolidated statements of operations as a gain or loss on interest rate swap. Refer to Note 7 for further information regarding this interest rate swap.

On September 28, 2022, the Company, LFS and LHLLC entered into a second amendment and waiver to the amended and restated Wintrust credit agreement (the “Second Amendment to the A&R Wintrust Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent. The Second Amendment to the A&R Wintrust Credit Agreement incorporates certain restricted payment provisions, among other things, to permit LFS to repurchase shares under the Company’s Share Repurchase Program (as defined in Note 6).

On May 5, 2023, LFS, LHLLC and the direct and indirect subsidiaries of LFS from time to time included as parties to the agreement entered into the Second Amended and Restated Credit Agreement (the “Second A&R Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent, which amends and restates the A&R Wintrust Credit Agreement. In

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accordance with the Second A&R Credit Agreement (i) lenders provided to LFS a $50.0 million senior secured revolving credit facility with a $5.0 million sublimit for the issuance of letters of credit, an increase of $25.0 million over the A&R Wintrust Revolving Loan, with a maturity date of February 24, 2028 (the “Second A&R Wintrust Revolving Loan”), and (ii) LFS repaid the then outstanding principal balance of the A&R Wintrust Term Loan using proceeds of the Second A&R Wintrust Revolving Loan. Prior to the execution of this agreement, the Company repaid $9.6 million of the then outstanding balance under the A&R Term Loan with cash on hand. As a result of the early repayment of the A&R Wintrust Term Loan and certain changes to the members of the loan syndicate under the Second A&R Wintrust Credit Agreement, the Company wrote off approximately $0.3 million of unamortized debt issuance costs, which are reported as a loss on early debt extinguishment on the Company's condensed consolidated statements of operations.

Prior to its repayment on May 5, 2023 and as of June 30, 2022, the interest rate in effect on the non-hedged portion of the A&R Wintrust Term Loan was 9.25% and 5.75%, respectively. For the period from April 1, 2023 through May 5, 2023 and from January 1, 2023 through May 5, 2023, the Company incurred interest on the A&R Wintrust Term Loan at a weighted average annual interest rate of 9.00% and 8.76%, respectively. For the three and six months ended June 30, 2022, the Company incurred interest on the A&R Wintrust Term Loan at a weighted average annual interest rate of 4.90% and 4.57%, respectively.

The Second A&R Wintrust Revolving Loan bears interest, at LFS’s option, at either the Term SOFR (as defined in the Second A&R Credit Agreement) (with a 0.15% floor) plus 3.10% or the Prime Rate (as defined in the Second A&R Credit Agreement) (with a 3.0% floor), subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA of LFS and its subsidiaries for the most recently ended four fiscal quarters.

The Second A&R Wintrust Revolving Loan is secured by (i) a valid, perfected and enforceable lien of the administrative agent on the ownership interests held by each of LFS and Wintrust Guarantors in their respective subsidiaries; and (ii) a valid, perfected and enforceable lien of the administrative agent on each of LFS and Wintrust Guarantors’ personal property, fixtures and real estate, subject to certain exceptions and limitations. Additionally, the re-payment of the Second A&R Wintrust Revolving Loan is jointly and severally guaranteed by each Wintrust Guarantor.

The Second A&R Credit Agreement contains representations and warranties, covenants and events of default that are customary for facilities of this type, as more particularly described in the Second A&R Credit Agreement. The Second A&R Wintrust Revolving Loan also contains three financial maintenance covenants, including (i) a requirement to have as of the last day of each quarter for the senior leverage ratio of LFS and its subsidiaries not to exceed an amount beginning at 2.00 to 1.00, (ii) a fixed charge coverage ratio of not less than 1.20 to 1.00 as of the last day of each fiscal quarter, commencing with the fiscal quarter ending March 31, 2023, and (iii) no unfinanced capital expenditures, except for unfinanced capital expenditures in the ordinary course of business not exceeding in the aggregate $4.0 million during any fiscal year; and no default or event of default (as defined in the Second A&R Credit Agreement) has occurred and is continuing, 50% of any portion of this annual limit, if not expended in the fiscal year for which it is permitted, may be carried over for expenditure in the next following fiscal year as stipulated by the agreement.

As of June 30, 2023, the Company had $10.0 million in borrowings outstanding under the Second A&R Wintrust Revolving Loan. As of December 31, 2022, the Company had no borrowings outstanding under the A&R Wintrust Revolving Loan. During the three and six months ended June 30, 2023, the maximum outstanding borrowings under either the Company's revolving loan arrangements at any time was $10.0 million during both periods and the average daily balance was approximately $6.3 million and $3.1 million, respectively. For the three and six months ended June 30, 2023, the Company incurred interest on the Second A&R Wintrust Revolving Loan at a weighted average annual interest rate of 7.70% for both periods.

During the three and six months ended June 30, 2022, the maximum outstanding borrowings under the A&R Wintrust Revolving Loan at any time was $3.5 million and $9.4 million, respectively, and the average daily balance was approximately $0.1 million for both periods. For the three and six months ended June 30, 2022, the Company incurred interest on the A&R Wintrust Revolving Loan at a weighted average annual interest rate of 4.91% and 4.37%, respectively.

At June 30, 2023, the Company had irrevocable letters of credit in the amount of $4.2 million with its lender to secure obligations under its self-insurance program.

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The following is a summary of the applicable margin and commitment fees payable on the Second A&R Wintrust Revolving Loan credit commitment:

Level						Senior Leverage Ratio						Applicable Margin for SOFR Revolver loans						Applicable Margin for Prime Revolving loans						Applicable Margin for commitment fee
I						Greater than 1.00 to 1.00						3.10		%				—		%				0.25		%
II						Less than or equal to 1.00 to 1.00						2.60		%				(0.50)		%				0.25		%

As of June 30, 2023, the Company was in compliance with all financial maintenance covenants as required by the A&R Wintrust Loans.

Sale-Leaseback Financing Transaction

On September 29, 2022, LC LLC and Royal Oak Acquisitions, LLC (the “Purchaser”) consummated the purchase of the real property under a sale and leaseback transaction, with an aggregate value of approximately $7.8 million (a purchase price of approximately $5.4 million and $2.4 million in tenant improvement allowances), pursuant to a purchase agreement under which the Purchaser purchased from LC LLC the Company’s facility and real property in Pontiac, MI (collectively, the “Pontiac Facility”).

In connection with the sale and leaseback transaction, LC LLC and Featherstone St Pontiac MI LLC (the “Landlord”) entered into a Lease Agreement (the “Lease Agreement”), dated September 29, 2022 (the “Lease Effective Date”) for the Pontiac Facility. Commencing on the Lease Effective Date, pursuant to the Lease Agreement, LC LLC has leased the Pontiac Facility, subject to the terms and conditions of the Lease Agreement. The Lease Agreement provides for a term of 25 years (the “Primary Term”). The Lease Agreement also provides LC LLC with the option to extend the Primary Term by two separate renewal terms of five years each (each a “Renewal Term”). Under the terms of the Lease Agreement, the Company’s annual minimum rent is $499,730, payable in monthly installments, subject to annual increases of approximately 2.5% each year under the Primary Term and for each year under the Renewal Terms, if exercised. LC LLC has a one-time option to terminate the Lease Agreement effective on the last day of the fifteenth lease year by providing written notice to the Landlord as more fully set forth in the Lease Agreement. The one-time termination option of the Lease Agreement would require LC LLC to pay to the Landlord a termination fee of approximately $1.7 million.

Pursuant to the terms and conditions set forth in the Lease Agreement, the Landlord has agreed to provide LC LLC with a tenant improvement allowance in an amount up to $2.4 million. LC LLC is responsible for the initial capital outlay and completion of the agreed upon improvement work. The Landlord will subsequently reimburse LC LLC for such items up to the stated allowance amount.

The Company accounted for the sale and leaseback arrangement as a financing transaction in accordance with ASC Topic 842, “Leases,” as the Lease Agreement was determined to be a finance lease. The Company concluded the Lease Agreement met the qualifications to be classified as a finance lease due to the significance of the present value of the lease payments, using an implicit rate of 11.11% to reflect the Company’s incremental borrowing rate associated with the $5.4 million purchase price as of the Lease Agreement date, compared to the fair value of the Pontiac Facility. The implicit rate associated with the aggregate purchase value, inclusive of tenant improvement allowances, was 6.53% as of the Lease Agreement date.

The presence of a finance lease indicates that control of the Pontiac Facility has not transferred to the Purchaser and, as such, the transaction was deemed a failed sale-leaseback and must be accounted for as a financing arrangement. As a result of this determination, the Company is viewed as having received the sale proceeds from the Purchaser in the form of a hypothetical loan collateralized by its leased facilities. The hypothetical loan is payable as principal and interest in the form of “lease payments” to the Purchaser. Principal repayments are recorded as a reduction to the financing liability. The Company will not derecognize the Pontiac Facility from its books for accounting purposes until the lease ends. No gain or loss was recognized under GAAP related to the sale and leaseback arrangement.

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Warrants

In conjunction with the Company's initial public offering, the Company issued Public Warrants, Private Warrants and $15 Exercise Price Sponsor Warrants. The Company issued certain Merger Warrants and Additional Merger Warrants in conjunction with the Company's business combination with LHLLC in July 2016 (the “Business Combination”). On July 20, 2021, the Public Warrants, Private Warrants, and Additional Merger Warrants expired by their terms. During the three months ended June 30, 2023, 600,000 $15 Exercise Price Sponsor Warrants and 163,444 Merger Warrants were exercised on a cashless basis by the holders of the warrants, which resulted in the warrants being converted into 167,564 and 45,797 shares of the Company's common stock, respectively. For the period from July 1, 2023 through July 20, 2023, the holders of the Merger Warrants exercised 443,032 warrants on a cashless basis, which resulted in the Merger Warrants being converted into 228,945 shares of the Company's common stock. The remaining 23,167 unexercised Merger Warrants expired by their terms on July 20, 2023.

The following table summarizes the underlying shares of common stock with respect to outstanding warrants:

			June 30, 2023						December 31, 2022
$15 Exercise Price Sponsor Warrants(1)(2)			—						600,000
Merger Warrants(3)(4)			466,199						629,643
Total			466,199						1,229,643

(1)    Exercisable for one share of common stock at an exercise price of $15.00 per share (“$15 Exercise Price Sponsor Warrants”).

(2)    Issued under a warrant agreement dated July 15, 2014, between Continental Stock Transfer and Trust Company, as warrant agent, and the Company.

(3)    Exercisable for one share of common stock at an exercise price of $12.50 per share (“Merger Warrants”).

(4)    Issued to the sellers of LHLLC.

Incentive Plan

Upon the consummation of the Company's Business Combination, the Company adopted an omnibus incentive plan (the “Omnibus Incentive Plan”) pursuant to which equity awards may be granted thereunder.

On March 25, 2022, the Board of Directors approved certain amendments to the Company's Omnibus Incentive Plan (the “2022 Amended and Restated Omnibus Incentive Plan”) to increase the number of shares of the Company's common stock that may be issued pursuant to awards by 350,000, for a total of 2,600,000 shares, and extended the term of the plan so that it will expire on the tenth anniversary of the date the stockholders approve the 2022 Amended and Restated Omnibus Incentive Plan. The amendments were approved by the Company's stockholders at the Annual Meeting held on June 22, 2022.

On March 29, 2023, the Board of Directors approved certain amendments to the Company's Omnibus Incentive Plan (the “2023 Amended and Restated Omnibus Incentive Plan”) to increase the number of shares of the Company's common stock that may be issued pursuant to awards by 450,000, for a total of 3,050,000 shares, and extended the term of the plan so that it will expire on the tenth anniversary of the date the stockholders approve the 2023 Amended and Restated Omnibus Incentive Plan. The amendments were acted upon by the Company's stockholders at the Annual Meeting held on June 22, 2023.

See Note 13 for a discussion of the Company's management incentive plans for restricted stock units (“RSUs”) granted, vested, forfeited and remaining unvested.

Share Repurchase Program

In September 2022, the Company announced that its Board of Directors approved a share repurchase program (the “Share Repurchase Program”) to repurchase shares of its common stock for an aggregate purchase price not to exceed $2.0 million. The share repurchase authority is valid through September 29, 2023. Share repurchases may be executed through various means, including, without limitation, open market transactions, privately negotiated transactions or by other means in accordance with federal securities laws. The Share Repurchase Program does not obligate the Company to acquire any particular amount of common stock, and the program may be suspended or terminated by the Company at any time at its discretion without prior notice. As of June 30, 2023, the Company has made share repurchases of approximately $2.0 million under its Share Repurchase Program.

Employee Stock Purchase Plan

Upon approval of the Company's stockholders on May 30, 2019, the Company adopted the Limbach Holdings, Inc. 2019 Employee Stock Purchase Plan (the “ESPP”). On January 1, 2020, the ESPP went into effect. The ESPP enables eligible employees, as defined by the ESPP, the right to purchase the Company's common stock through payroll deductions during

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The Company measures the fair value of financial assets and liabilities in accordance with ASC Topic 820 – Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC Topic 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows:

•Level 1 — inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date;

•Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability either directly or indirectly such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities; and

•Level 3 — unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The Company believes that the carrying amounts of its financial instruments, including cash and cash equivalents, trade accounts receivable and accounts payable, consist primarily of instruments without extended maturities, which approximate fair value primarily due to their short-term maturities and low risk of counterparty default. The Company considers all highly liquid investments purchased with a maturity of 90 days or less on the date of purchase to be cash equivalents. Cash equivalents as of June 30, 2023 consisted of overnight repurchase agreements in which cash from the Company's main operating checking account is invested overnight in highly liquid, short term investments, one U.S. Treasury Bill and certain investments in money market funds sponsored by a large financial institution. The Company had no such investments as of December 31, 2022. For the three and six months ending June 30, 2023, the Company recognized interest income of approximately $0.2 million associated with its overnight repurchase agreements, U.S. Treasury Bills and money market funds. The Company has not experienced any losses in its cash and cash equivalents and management believes the Company is not exposed to significant credit risk with respect to such accounts.

									Fair Value at Reporting Date Using
(in thousands)			June 30, 2023						Level 1						Level 2						Level 3
Cash equivalents:
Overnight repurchase agreements			$	32,100					$	32,100
U.S. Treasury Bills			5,000						5,000						$	—					$	—
Money market fund			3,750						3,750						—						—
Total			$	40,850					$	40,850					$	—					$	—

Second A&R Wintrust Revolving Loan

The Company also believes that the carrying value of the Second A&R Wintrust Revolving Loan approximates its respective fair value due to the variable rate on such debt. As of June 30, 2023, the Company determined that the fair value of the Second

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A&R Wintrust Revolving Loan was $10.0 million. Such fair value was determined using discounted estimated future cash flows using level 3 inputs.

Earnout Payments

As a part of the total consideration for the Jake Marshall Transaction, the former owners of JMLLC and CSLLC may receive up to an aggregate of $6.0 million in cash, consisting of two tranches of $3.0 million, as defined in the purchase agreement, if the gross profit of the acquired companies equals or exceeds $10.0 million in (i) the approximately 13 month period from closing through December 31, 2022 (the “2022 Earnout Period”) or (ii) fiscal year 2023 (the “2023 Earnout Period”), respectively (collectively, the “Earnout Payments”). To the extent, however, that the gross profit of the Acquired Companies is less than $10.0 million, but exceeds $8.0 million, during any of the 2022 Earnout Period or 2023 Earnout Period, the $3.0 million amount will be prorated for such period. The Company initially recognized $3.1 million in contingent consideration, of which the entire balance was included in other long-term liabilities in the Company’s condensed consolidated balance sheets on December 2, 2021. The fair value of contingent Earnout Payments is based on generating growth rates on the projected gross margins of the Acquired Entities and calculating the associated contingent payments based on achieving the earnout targets, which are reassessed each reporting period. In April 2023, the Company made a $3.0 million payment to the former owners of JMLLC and CSLLC related to the 2022 Earnout Period. Based on the Company’s ongoing assessment of the fair value of contingent earnout liabilities, the Company recorded a net increase in the estimated fair value of such liabilities of $0.2 million and $0.3 million for the three and six ended June 30, 2023, respectively, which was presented in change in fair value of contingent consideration in the Company's condensed consolidated statements of operations. During the three and six months ended June 30, 2022, the Company recorded a net increase in the estimated fair value of such liabilities of $0.8 million for both periods. The Company has assessed the estimated exposure to the contingent earnout liability for the 2023 Earnout Period to be approximately $2.7 million at June 30, 2023, which was included in accrued expenses and other current liabilities on the Company's condensed consolidated balance sheets.

The Company determines the fair value of the Earnout Payments by utilizing the Monte Carlo Simulation method, which represents a Level 3 measurement. The Monte Carlo Simulation method models the probability of different financial results of the Acquired Entities during the earn-out period, utilizing a discount rate, which reflects a credit spread over the term-adjusted continuous risk-free rate. As of June 30, 2023 and 2022, the Earnout Payments associated with the Jake Marshall Transaction were valued utilizing a discount rate of 10.2% and 6.83%, respectively. The discount rate was calculated using the build-up method with a risk-free rate commensurate with the term of the Earnout Payments based on the U.S. Treasury Constant Maturity Yield.

Interest Rate Swap

Earnings per Share

The Company calculates earnings per share in accordance with ASC Topic 260 - Earnings Per Share (“EPS”). Basic earnings per common share applicable to common stockholders is computed by dividing earnings applicable to common stockholders by the weighted-average number of common shares outstanding and assumed to be outstanding. Diluted EPS assumes the dilutive effect of outstanding common stock warrants, shares issued in conjunction with the Company’s ESPP and RSUs, all using the treasury stock method.

The following table sets forth the computation of the basic and diluted earnings per share attributable to the Company's common shareholders for the three and six months ended June 30, 2023 and 2022:

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						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands, except per share amounts)						2023						2022						2023						2022
EPS numerator:
Net income (loss)						$	5,320					$	866					$	8,313					$	(650)
EPS denominator:
Weighted average shares outstanding – basic						10,644						10,423						10,560						10,422
Impact of dilutive securities(1)						863						144						776						—
Weighted average shares outstanding – diluted						11,507						10,567						11,336						10,422
EPS:
Basic						$	0.50					$	0.08					$	0.79					$	(0.06)
Diluted						$	0.46					$	0.08					$	0.73					$	(0.06)

(1)    For the six months ended June 30, 2022, the Company excluded 150,420 of potentially dilutive securities related to certain of the Company's outstanding common stock warrants, shares issued in conjunction with the Company's ESPP and nonvested RSUs. These securities were excluded from the computation as their effect would have been anti-dilutive. As a result, the computations of net loss per share for the six months ended June 30, 2022 is the same for both basic and diluted.

The following table summarizes the securities that were antidilutive or out-of-the-money, and therefore, were not included in the computations of diluted income per common share:

			Three Months Ended June 30,												Six Months Ended June 30,
			2023						2022						2023						2022
Out-of-the-money warrants (see Note 6)			—						1,229,643						—						1,229,643
Service-based RSUs (See Note 13)			1						17,595						26						72,871
Performance and market-based RSUs(1)			15						48,229						60						85,969
Employee Stock Purchase Plan			643						—						2,426						8,451
Total			659						1,295,467						2,512						1,396,934

(1)    For the three and six months ended June 30, 2022, certain MRSU awards (each defined in Note 13) were not included in the computation of diluted income per common share because the performance and market conditions were not satisfied during the periods and would not be satisfied if the reporting date was at the end of the contingency period.

The Company is taxed as a C corporation.

For interim periods, the provision for income taxes (including federal, state, local and foreign taxes) is calculated based on the estimated annual effective tax rate, adjusted for certain discrete items for the full fiscal year. Cumulative adjustments to the Company's estimate are recorded in the interim period in which a change in the estimated annual effective rate is determined.

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Each quarter the Company updates its estimate of the annual effective tax rate, and if its estimated tax rate changes, the Company makes a cumulative adjustment.

The following table presents our income tax provision and our income tax rate for the three and six months ended June 30, 2023 and 2022.

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands, except percentages)						2023						2022						2023						2022
Income tax provision (benefit)						$	2,025					$	237					$	2,647					$	(379)
Income tax rate						27.6		%				21.5		%				24.2		%				36.8		%

The U.S. federal statutory tax rate was 21% for each of the three and six months ended June 30, 2023 and 2022. The difference between the U.S. federal statutory tax rate and the Company’s effective tax rate period over period was primarily due to state income taxes, tax credits, other permanent adjustments and discrete tax items.

No valuation allowance was required as of June 30, 2023 or December 31, 2022.

As discussed in Note 1, the Company operates in two segments, (i) GCR, in which the Company generally manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services awarded to the Company by general contractors or construction managers, and (ii) ODR, in which the Company provides maintenance or service primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. These segments are reflective of how the Company’s Chief Operating Decision Maker (“CODM”) reviews operating results for the purposes of allocating resources and assessing performance. The Company's CODM is comprised of its President and Chief Executive Officer and Executive Vice President and Chief Financial Officer.

In accordance with ASC Topic 280 – Segment Reporting, the Company has elected to aggregate all of the GCR work performed at branches into one GCR reportable segment and all of the ODR work performed at branches into one ODR reportable segment. All transactions between segments are eliminated in consolidation.

On January 17, 2023, the Company announced its planned transition succession, pursuant to which Charles A. Bacon III stepped down as President and Chief Executive Officer on March 28, 2023, and Michael M. McCann, the Company’s former Executive Vice President and Chief Operating Officer, was appointed President and Chief Executive Officer. Following the transition, the Company revised its segment presentation to align with how Mr. McCann assesses performance and makes resource allocation decisions for its operating segments, which is based on segment revenue and segment gross profit. Selling, general and administrative ("SG&A") expenses are no longer reported on a segment basis as the Company's current CODM does not review discrete segment financial information for SG&A in order to assess performance. Interest expense is not allocated to segments because of the corporate management of debt service.

The Company restated segment information for the historical periods presented herein to conform to the current presentation. This change in segment presentation does not affect the Company’s unaudited condensed consolidated statements of operations, balance sheets or statements of cash flows.

All of the Company’s identifiable assets are located in the United States, which is where the Company is domiciled.

Condensed consolidated segment information for the three and six months ended June 30, 2023 and 2022 were as follows:

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			Three Months Ended June 30,												Six Months Ended June 30,
(in thousands)			2023						2022						2023						2022
Statement of Operations Data:
Revenue:
GCR			$	66,102					$	66,336					$	128,393					$	138,268
ODR			58,780						49,784						117,498						92,674
Total revenue			124,882						116,120						245,891						230,942
Gross profit:
GCR			11,272						8,694						21,590						17,052
ODR			17,241						12,626						33,150						22,608
Total gross profit			28,513						21,320						54,740						39,660
Selling, general and administrative(1)			20,416						18,690						41,466						37,424
Change in fair value of contingent consideration			162						765						303						765
Amortization of intangibles			383						399						766						798
Operating income			$	7,552					$	1,466					$	12,205					$	673
Less unallocated amounts:
Interest expense			(511)						(478)						(1,178)						(964)
Interest income			247						—						247						—
Gain (loss) on disposition of property and equipment			175						147						(40)						111
Loss on early termination of operating lease			—						(32)						—						(849)
Loss on early debt extinguishment			(311)						—						(311)						—
Gain on change in fair value of interest rate swap			193						—						37						—
Total unallocated amounts			(207)						(363)						(1,245)						(1,702)
Income (loss) before income taxes			$	7,345					$	1,103					$	10,960					$	(1,029)

(1)    Included within selling, general and administrative expenses was $1.1 million and $0.6 million of stock based compensation expense for the three months ended June 30, 2023 and 2022, respectively. For the six month ended June 30, 2023 and 2022, selling, general and administrative expenses included $2.2 million and $1.2 million of stock based compensation expenses, respectively.

The Company does not identify capital expenditures and total assets by segment in its internal financial reports due in part to the shared use of a centralized fleet of vehicles and specialized equipment. Interest expense is also not allocated to segments because of the Company’s corporate management of debt service, including interest.

The Company leases real estate, trucks and other equipment. The determination of whether an arrangement is, or contains, a lease is performed at the inception of the arrangement. Classification and initial measurement of the right-of-use asset and lease liability are determined at the lease commencement date. The Company elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheets. Instead, the short-term leases are recognized in expense on a straight-line basis over the lease term.

The Company's arrangements include certain non-lease components such as common area and other maintenance for leased real estate, as well as mileage, fuel and maintenance costs related to leased vehicles. For all leased asset classes, the Company has elected to not separate non-lease components from lease components and will account for each separate lease component and non-lease component associated with the lease as a single lease component. The Company does not guarantee any residual value in its lease agreements, and there are no material restrictions or covenants imposed by lease arrangements. Real estate leases typically include one or more options to extend the lease. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term. For the Company's leased vehicles, the Company uses the interest rate implicit in its leases with the lessor to discount lease payments at the lease commencement date. When the implicit rate is not readily available, as is the case with the Company's real estate leases, the Company uses quoted borrowing rates on its secured debt.

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Related Party Lease Agreement. In conjunction with the closing of the Jake Marshall Transaction, the Company entered into an operating lease for certain land and facilities owned by a former member of JMLLC who became a full-time employee of the Company. The lease term is 10 years and includes an option to extend the lease for two successive periods of two years each through November 2035. Base rent for the term of the lease is $37,500 per month for the first five years with payment commencing on January 1, 2022. The fixed rent payment is escalated to $45,000 per month for years 6 through 10 of the lease term. Fixed rent payments for the extension term shall be increased from $45,000 by the percentage increase, if any, in the consumer price index from the lease commencement date. In addition, under the agreement, the Company is required to pay its share of estimated property taxes and operating expenses, both of which are variable lease expenses.

Southern California Sublease. In June, 2021, the Company entered into a sublease agreement with a third party for the entire ground floor of its leased space in Southern California, consisting of 71,787 square feet. Under the terms of the sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.6 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The initial lease term commenced in September 2021 and continues through April 30, 2027. As of June 30, 2023, the Company remains obligated under the original lease for such office space and, in the event the sublessee of such office space fails to satisfy its obligations under the sublease, the Company would be required to satisfy its obligations directly to the landlord under such original lease.

In addition, during the first quarter of 2022, the Company entered into an amendment to the aforementioned sublease agreement, which, among other things, expanded the sublease premises to include the entire second floor of its leased space in Southern California, consisting of 16,720 square feet. Under the terms of the amended sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.8 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The amended sublease term commenced in March 2022 and continues through April 30, 2027. For the three and six months ended June 30, 2023, the Company recorded approximately $0.3 million and $0.5 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement. For the three and six months ended June 30, 2022, the Company recorded approximately $0.2 million and $0.4 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement.

Pittsburgh Lease Termination. In March, 2022, the Company entered into a lease termination agreement (the “Lease Termination Agreement”) to terminate, effective March 31, 2022, the lease associated with the Company’s office space located in Pittsburgh, Pennsylvania, which previously served as its corporate headquarters. Absent the Lease Termination Agreement, the lease would have expired in accordance with its terms in July 2025. Pursuant to the Lease Termination Agreement, in exchange for allowing the Company to terminate the lease early, the Company agreed to pay a termination fee in the aggregate of approximately $0.7 million in 16 equal monthly installments commencing on April 1, 2022. The Company recognized the full termination fee expense during the first quarter of 2022.

In connection with the lease termination, the Company recognized a gain of $0.1 million associated with the derecognition of the operating lease right-of-use asset and corresponding operating lease liabilities associated with the operating lease and recorded a $0.1 million loss on the disposal of leasehold improvements and moving expenses.

The following table summarizes the lease amounts included in the Company's condensed consolidated balance sheets:

(in thousands)			Classification on the Condensed Consolidated Balance Sheets						June 30, 2023						December 31, 2022
Assets
Operating			Operating lease right-of-use assets(1)						$	17,149					$	18,288
Finance			Property and equipment, net(2)(3)						9,307						7,402
Total lease assets									$	26,456					$	25,690
Liabilities
Current
Operating			Current operating lease liabilities						$	3,598					$	3,562
Finance			Current portion of long-term debt						2,431						2,135
Noncurrent
Operating			Long-term operating lease liabilities						14,513						15,643
Finance			Long-term debt(4)						9,881						8,170
Total lease liabilities									$	30,423					$	29,510

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(1)     Operating lease assets are recorded net of accumulated amortization of $11.7 million at June 30, 2023 and $12.2 million at December 31, 2022.

(2)    Finance lease vehicle assets are recorded net of accumulated amortization of $5.1 million at June 30, 2023 and $6.0 million at December 31, 2022.

(3)    Includes approximately $2.5 million and $2.6 million of net property assets associated with the Company's Pontiac Facility as of June 30, 2023 and December 31, 2022, respectively.

(4)    Includes approximately $5.4 million associated with the Company's sale and leaseback financing transaction. See Note 5 for further detail.

The following table summarizes the lease costs included in the Company's condensed consolidated statements of operations for the three and six months ended June 30, 2023 and 2022:

									Three Months Ended June 30,												Six Months Ended June 30,
(in thousands)			Classification on the Condensed Consolidated Statement of Operations						2023						2022						2023						2022
Operating lease cost			Cost of revenue(1)						$	522					$	657					$	1,083					$	1,351
Operating lease cost			Selling, general and administrative(1)						612						631						1,257						1,335
Finance lease cost
Amortization			Cost of revenue(2)						667						685						1,298						1,336
Interest			Interest expense, net(2)						86						66						152						132
Total lease cost									$	1,887					$	2,039					$	3,790					$	4,154

(1)    Operating lease costs recorded in cost of revenue included $0.1 million of variable lease costs for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. In addition, $0.1 million of variable lease costs are included in selling, general and administrative for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. These variable costs consist of the Company's proportionate share of operating expenses, real estate taxes and utilities.

(2)     Finance lease costs recorded in cost of revenue include variable lease costs of $0.9 million and $1.0 million for the three months ended June 30, 2023 and 2022, respectively, and $1.8 million for both the six months ended June 30, 2023 and 2022, respectively. These variable lease costs consist of fuel, maintenance, and sales tax charges.

The future undiscounted minimum finance lease payments, as reconciled to the discounted minimum lease obligation indicated on the Company’s condensed consolidated balance sheets within current and long-term debt, less interest, and under current and long-term operating leases, less imputed interest, as of June 30, 2023 were as follows (in thousands):

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						Finance Lease Obligations																		Operating Lease Obligations
Year ending:						Vehicles						Pontiac Facility						Total Finance						Non-Related Party						Related Party(1)						Total Operating						Sublease Receipts(2)
Remainder of 2023						$	1,501					$	253					$	1,754					$	2,033					$	225					$	2,258					$	448
2024						2,466						515						2,981						3,435						450						3,885						912
2025						1,922						528						2,450						2,928						450						3,378						939
2026						1,391						542						1,933						2,815						450						3,265						967
2027						483						555						1,038						1,842						540						2,382						326
Thereafter						—						14,302						14,302						1,834						4,275						6,109						—
Total minimum lease payments						7,763						16,695						24,458						14,887						6,390						21,277						$	3,593
Financing Component (3)						(802)						(11,343)						(12,145)						(1,686)						(1,479)						(3,165)
Net present value of minimum lease payments						6,961						5,351						12,312						13,200						4,911						18,111
Less: current portion of finance and operating lease obligations						(2,431)						—						(2,431)						(3,352)						(246)						(3,598)
Long-term finance and operating lease obligations						$	4,530					$	5,351					$	9,881					$	9,848					$	4,665					$	14,513

(1)    Associated with the aforementioned related party lease entered into with a former member of JMLLC.

(2)    Associated with the aforementioned third party sublease.

(3)     The financing component for finance lease obligations represents the interest component of finance leases that will be recognized as interest expense in future periods. The financing component for operating lease obligations represents the effect of discounting the lease payments to their present value.

The following is a summary of the lease terms and discount rates as of:

			June 30, 2023						December 31, 2022
Weighted average lease term (in years):
Operating			6.68						6.98
Finance (1)			3.18						2.73
Weighted average discount rate:
Operating			4.88		%				4.76		%
Finance (1)			6.40		%				5.06		%

(1)     Excludes the weighted average lease term and weighted average discount rate associated with the aforementioned sale-leaseback financing transaction, which has a Primary Term of 25 years and utilized an implicit rate of 11.11%. See Note 5 for further detail.

The following is a summary of other information and supplemental cash flow information related to finance and operating leases:

						Six months ended June 30,
(in thousands)						2023						2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases						$	2,294					$	2,619
Operating cash flows from finance leases						152						132
Financing cash flows from finance leases						1,302						1,358
Right-of-use assets exchanged for lease liabilities:
Operating leases						742						—
Finance leases						3,392						1,968
Right-of-use assets disposed or adjusted modifying operating leases liabilities						—						(1,276)
Right-of-use assets disposed or adjusted modifying finance leases liabilities						$	(30)					(77)

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Legal. The Company is continually engaged in administrative proceedings, arbitrations, and litigation with owners, general contractors, suppliers, employees, former employees and other unrelated parties, all arising in the ordinary courses of business. The ultimate resolution of these contingencies could, individually or in the aggregate, be material to the condensed consolidated financial statements. In the opinion of the Company’s management, the current belief is that the results of these actions will not have a material adverse effect on the financial position, results of operations, or cash flows of the Company.

On January 23, 2020, plaintiff, Bernards Bros. Inc. (“Bernards”), filed a complaint against the Company in Superior Court of the State of California for the County of Los Angeles. The complaint alleges that the Company's Southern California business unit refused to honor a proposal made to Bernards to act as a subcontractor on a construction project, and that, as a result of the wrongful failure to honor the proposal, Bernards suffered damages in excess of $3.0 million plus interest, including alleged increased costs for hiring a different subcontractor to perform the work. The Company has vigorously defended the suit. Per the agreement of the Company and Bernards, in January 2022, the Court appointed a private referee to manage the case and adjudicate the dispute. A trial took place before the referee in January 2023, and on April 30, 2023, the referee issued an Amended Statement of Decision awarding Bernards approximately $2.2 million. As of December 31, 2022, the Company had determined that a loss was probable, and, as such, recorded an estimated loss contingency in the amount of $2.2 million, which is included in accrued expenses and other current liabilities reported within the Company’s consolidated balance sheets. In addition, the estimated loss contingency was recorded within selling, general and administrative expenses on the Company’s consolidated statements of operations and was presented within GCR selling, general and administrative expenses within the Company’s segment operations data. The Company is currently evaluating its options to appeal the referee's decisions.

Surety. The terms of its construction contracts frequently require that the Company obtain from surety companies, and provide to its customers, payment and performance bonds (“Surety Bonds”) as a condition to the award of such contracts. The Surety Bonds secure the Company's payment and performance obligations under such contracts, and the Company has agreed to indemnify the surety companies for amounts, if any, paid by them in respect of Surety Bonds issued on its behalf. In addition, at the request of labor unions representing certain of the Company's employees, Surety Bonds are sometimes provided to secure obligations for wages and benefits payable to or for such employees. Public sector contracts require Surety Bonds more frequently than private sector contracts, and accordingly, the Company's bonding requirements typically increase as the amount of public sector work increases. As of June 30, 2023, the Company had approximately $117.5 million in surety bonds outstanding. The Surety Bonds are issued by surety companies in return for premiums, which vary depending on the size and type of bond.

Collective Bargaining Agreements. Many of the Company’s craft labor employees are covered by collective bargaining agreements. The agreements require the Company to pay specified wages, provide certain benefits and contribute certain amounts to multi-employer pension plans. If the Company withdraws from any of the multi-employer pension plans or if the plans were to otherwise become underfunded, the Company could incur additional liabilities related to these plans. Although the Company has been informed that some of the multi-employer pension plans to which it contributes have been classified as “critical” status, the Company is not currently aware of any significant liabilities related to this issue.

Self-insurance. The Company is substantially self-insured for workers’ compensation and general liability claims, in the view of the relatively high per-incident deductibles the Company absorbs under its insurance arrangements for these risks. The Company purchases workers’ compensation and general liability insurance under policies with per-incident deductibles of $250,000 per occurrence and a $4.4 million maximum aggregate deductible loss limit per year. Losses incurred over primary policy limits are covered by umbrella and excess policies up to specified limits with multiple excess insurers. The Company accrues for the unfunded portion of costs for both reported claims and claims incurred but not reported. The liability for unfunded reported claims and future claims is reflected on the consolidated balance sheets as current and non-current liabilities. The liability is determined by establishing a reserve for each reported claim on a case-by-case basis based on the nature of the claim and historical loss experience for similar claims plus an allowance for the cost of incurred but not reported claims. The current portion of the liability is included in accrued expenses and other current liabilities on the consolidated balance sheets. The non-current portion of the liability is included in other long-term liabilities on the consolidated balance sheets.

The Company is self-insured related to medical and dental claims under policies with annual per-claimant and annual aggregate stop-loss limits. The Company accrues for the unfunded portion of costs for both reported claims and claims incurred but not reported. The liability for unfunded reported claims and future claims is reflected on the consolidated balance sheets as a current liability in accrued expenses and other current liabilities.

The components of the self-insurance liability as of June 30, 2023 and December 31, 2022 are as follows:

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(in thousands)			June 30, 2023						December 31, 2022
Current liability — workers’ compensation and general liability			$	67					$	158
Current liability — medical and dental			433						557
Non-current liability			502						343
Total liability			$	1,002					$	1,058
Restricted cash			$	65					$	113

The restricted cash balance represents an imprest cash balance set aside for the funding of workers' compensation and general liability insurance claims. This amount is replenished either when depleted or at the beginning of each month.

The Company initially adopted the Omnibus Incentive Plan on July 20, 2016 for the purpose of: (a) encouraging the profitability and growth of the Company through short-term and long-term incentives that are consistent with the Company’s objectives; (b) giving participants an incentive for excellence in individual performance; (c) promoting teamwork among participants; and (d) giving the Company a significant advantage in attracting and retaining key employees, directors and consultants. To accomplish such purposes, the Omnibus Incentive Plan, and such subsequent amendments to the Omnibus Incentive Plan, provides that the Company may grant options, stock appreciation rights, restricted shares, RSUs, performance-based awards (including performance-based restricted shares and restricted stock units), other share based awards, other cash-based awards or any combination of the foregoing.

Following the approval of the 2023 Amended and Restated Omnibus Incentive Plan, the Company has reserved 3,050,000 shares of its common stock for issuance. The number of shares issued or reserved pursuant to the Omnibus Incentive Plan will be adjusted by the plan administrator, as they deem appropriate and equitable, as a result of stock splits, stock dividends, and similar changes in the Company’s common stock. In connection with the grant of an award, the plan administrator may provide for the treatment of such award in the event of a change in control. All awards are made in the form of shares only.

Service-Based Awards

The Company grants service-based stock awards in the form of RSUs. Service-based RSUs granted to executives, employees, and non-employee directors vest ratably, on an annual basis, over three years and in the case of certain awards to non-employee directors, one year. The grant date fair value of the service-based awards was equal to the closing market price of the Company’s common stock on the date of grant. For both the three months ended June 30, 2023 and 2022, the Company recognized $0.3 million and $0.4 million, respectively, of stock-based compensation expense related to outstanding service-based RSUs. For the six months ended June 30, 2023 and 2022, the Company recognized $0.7 million of stock-based compensation expense related to outstanding service-based RSUs during both periods.

The following table summarizes the Company's service-based RSU activity for the six months ended June 30, 2023:

			Awards						Weighted-Average Grant Date Fair Value
Unvested at December 31, 2022			280,275						$	9.06
Granted			162,369						11.77
Vested			(163,354)						8.58
Forfeited			(42,131)						10.63
Unvested at June 30, 2023			237,159						$	10.97

Performance-Based Awards

The Company grants performance-based restricted stock units (“PRSUs”) under which shares of the Company’s common stock may be earned based on the Company’s performance compared to defined metrics. The number of shares earned under a performance award may vary from zero to 150% of the target shares awarded, based upon the Company’s performance compared to the metrics. The metrics used for the grant are determined by the Company’s Compensation Committee of the Board of Directors and are based on internal measures such as the achievement of certain predetermined adjusted EBITDA, EPS growth and EBITDA margin performance goals over a three year period.

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The Company recognizes stock-based compensation expense for these awards over the vesting period based on the projected probability of achievement of the performance conditions as of the end of each reporting period during the performance period and may periodically adjust the recognition of such expense, as necessary, in response to any changes in the Company’s forecasts with respect to the performance conditions. For the three months ended June 30, 2023 and 2022, the Company recognized $0.8 million and $0.2 million, respectively, of stock-based compensation expense related to outstanding PRSUs. For the six months ended June 30, 2023 and 2022, the Company recognized $1.5 million and $0.4 million, respectively, of stock-based compensation expense related to outstanding PRSUs.

The following table summarizes the Company's PRSU activity for the six months ended June 30, 2023:

			Awards						Weighted-Average Grant Date Fair Value
Unvested at December 31, 2022			497,940						$	8.32
Granted			285,005						12.60
Performance factor adjustment(1)			32,327						4.29
Vested			(121,827)						4.29
Forfeited			(116,911)						9.81
Unvested at June 30, 2023			576,534						$	10.75

(1)     Performance-based awards covering the three year period ended December 31, 2022 were paid out in the first quarter of 2023 based on the approval of the Company's Compensation Committee. The performance factor during the measurement period used to determine compensation payouts was 136.13% of the pre-defined metric target of 100%, which resulted in a positive performance factor adjustment and the issuance of 32,327 of additional awards associated with the original grant.

Market-Based Awards

The vesting of the Company's market-based RSU (“MRSUs”) was contingent upon the Company’s closing price of a share of the Company's common stock on the Nasdaq Capital market, or such other applicable principal securities exchange or quotation system, achieving at least $18.00 over a period of eighty consecutive trading days during the three-year period commencing on August 1, 2018 and concluding on July 31, 2021. On September 4, 2020, the Compensation Committee of the Board of Directors of the Company approved amendments to modify the MRSUs to extend the measurement period to July 16, 2022. In addition to the market performance-based vesting condition, the vesting of such restricted stock unit was subject to continued employment from August 1, 2017 through the later of July 31, 2019 or the date on which the Compensation Committee certifies the achievement of the performance goal. The Company accounted for this amendment as a Type I modification and recognized approximately $0.2 million of incremental stock-based compensation expense over 1.26 years from the modification date based on an updated Monte Carlo simulation model. These awards expired on July 16, 2022 as the MRSU award market condition was not achieved.

Stock-Based Compensation Expense

Total recognized stock-based compensation expense amounted to $1.1 million and $0.6 million for the three months ended June 30, 2023 and 2022, respectively. For the six months ended June 30, 2023 and 2022, the Company recognized stock-based compensation expense of $2.2 million and $1.2 million, respectively. The aggregate fair value as of the vest date of RSUs that vested during the six months ended June 30, 2023 and 2022 was $3.4 million and $1.1 million, respectively. Total unrecognized stock-based compensation expense related to unvested RSUs which are probable of vesting was $4.4 million at June 30, 2023. These costs are expected to be recognized over a weighted average period of 1.83 years.

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v3.23.2

Cover - shares	6 Months Ended
	Jun. 30, 2023	Aug. 07, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-36541
Entity Registrant Name	LIMBACH HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-5399422
Entity Address, Address Line One	797 Commonwealth Drive
Entity Address, City or Town	Warrendale
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15086
City Area Code	412
Local Phone Number	359-2100
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	LMB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,003,424
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001606163
Current Fiscal Year End Date	--12-31

v3.23.2

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 45,929	$ 36,001
Restricted cash	65	113
Accounts receivable (net of allowance for credit losses of $295 and net of allowance for doubtful accounts of $234 as of June 30, 2023 and December 31, 2022, respectively)	87,230	124,442
Contract assets	59,424	61,453
Income tax receivable	814	95
Other current assets	5,747	3,886
Total current assets	199,209	225,990
Property and equipment, net	19,623	18,224
Intangible assets, net	14,575	15,340
Goodwill	11,370	11,370
Operating lease right-of-use assets	17,149	18,288
Deferred tax asset	4,999	4,829
Other assets	502	515
Total assets	267,427	294,556
Current liabilities:
Current portion of long-term debt	2,431	9,564
Less: current portion of finance and operating lease obligations	3,598	3,562
Accounts payable, including retainage	53,376	75,122
Contract liabilities	43,682	44,007
Accrued income taxes	1,505	1,888
Accrued expenses and other current liabilities	22,677	24,942
Total current liabilities	127,269	159,085
Long-term debt	19,485	21,528
Long-term finance and operating lease obligations	14,513	15,643
Other long-term liabilities	502	2,858
Total liabilities	161,769	199,114
Commitments and contingencies (Note 12)
STOCKHOLDERS’ EQUITY
Common stock, $0.0001 par value; 100,000,000 shares authorized, issued 10,946,316 and 10,471,410, respectively, and 10,766,664 and 10,291,758 outstanding, respectively	1	1
Additional paid-in capital	89,712	87,809
Treasury stock, at cost (179,652 shares at both period ends)	(2,000)	(2,000)
Retained earnings	17,945	9,632
Total stockholders’ equity	105,658	95,442
Total liabilities and stockholders’ equity	$ 267,427	$ 294,556

v3.23.2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss, current	$ 295	$ 234
Common stock, par or stated value per share (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares, issued (in shares)	10,946,316	10,471,410
Common stock, shares, outstanding (in shares)	10,766,664	10,291,758
Treasury stock (in shares)	179,652	179,652

v3.23.2

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 124,882	$ 116,120	$ 245,891	$ 230,942
Cost of revenue	96,369	94,800	191,151	191,282
Gross profit	28,513	21,320	54,740	39,660
Operating expenses:
Selling, general and administrative	20,416	18,690	41,466	37,424
Change in fair value of contingent consideration	162	765	303	765
Amortization of intangibles	383	399	766	798
Total operating expenses	20,961	19,854	42,535	38,987
Operating income	7,552	1,466	12,205	673
Other (expenses) income:
Interest expense	(511)	(478)	(1,178)	(964)
Interest income	247	0	247	0
Gain (loss) on disposition of property and equipment	175	147	(40)	111
Loss on early termination of operating lease	0	(32)	0	(849)
Loss on early debt extinguishment	(311)	0	(311)	0
Gain on change in fair value of interest rate swap	193	0	37	0
Total other expenses	(207)	(363)	(1,245)	(1,702)
Income (loss) before income taxes	7,345	1,103	10,960	(1,029)
Income tax provision (benefit)	2,025	237	2,647	(379)
Net income (loss)	$ 5,320	$ 866	$ 8,313	$ (650)
Earnings (loss) per common share:
Basic (in usd per share)	$ 0.50	$ 0.08	$ 0.79	$ (0.06)
Diluted (in usd per share)	$ 0.46	$ 0.08	$ 0.73	$ (0.06)
Weighted average number of shares outstanding:
Basic (in shares)	10,644,423	10,423,068	10,560,381	10,421,886
Diluted (in shares)	11,507,311	10,567,304	11,336,474	10,421,886

v3.23.2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Number of Shares	Additional paid-in capital	Treasury stock, at cost	Retained earnings
Beginning balance (in shares) at Dec. 31, 2021		10,304,242
Beginning balance at Dec. 31, 2021	$ 87,838	$ 1	$ 85,004		$ 2,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	599		599
Shares issued related to vested restricted stock units (in shares)		105,928
Shares issued related to vested restricted stock units	0
Tax withholding related to vested restricted stock units	(148)		(148)
Shares issued related to employee stock purchase plan (in shares)		12,898
Shares issued related to employee stock purchase plan	98		98
Net (loss) income	(1,516)				(1,516)
Ending balance (in shares) at Mar. 31, 2022		10,423,068
Ending balance at Mar. 31, 2022	86,871	$ 1	85,553		1,317
Beginning balance (in shares) at Dec. 31, 2021		10,304,242
Beginning balance at Dec. 31, 2021	87,838	$ 1	85,004		2,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(650)
Ending balance (in shares) at Jun. 30, 2022		10,423,068
Ending balance at Jun. 30, 2022	88,312	$ 1	86,128		2,183
Beginning balance (in shares) at Mar. 31, 2022		10,423,068
Beginning balance at Mar. 31, 2022	86,871	$ 1	85,553		1,317
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	575		575
Net (loss) income	866				866
Ending balance (in shares) at Jun. 30, 2022		10,423,068
Ending balance at Jun. 30, 2022	$ 88,312	$ 1	86,128		2,183
Beginning balance (in shares) at Dec. 31, 2022		10,471,410
Treasury stock (in shares) at Dec. 31, 2022	(179,652)			(179,652)
Beginning balance at Dec. 31, 2022	$ 95,442	$ 1	87,809	$ (2,000)	9,632
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,133		1,133
Shares issued related to vested restricted stock units (in shares)		250,548
Shares issued related to vested restricted stock units	0
Tax withholding related to vested restricted stock units	(428)		(428)
Shares issued related to employee stock purchase plan (in shares)		10,997
Shares issued related to employee stock purchase plan	97		97
Net (loss) income	2,993				2,993
Ending balance (in shares) at Mar. 31, 2023		10,732,955
Treasury stock (in shares) at Mar. 31, 2023				(179,652)
Ending balance at Mar. 31, 2023	$ 99,237	$ 1	88,611	$ (2,000)	12,625
Beginning balance (in shares) at Dec. 31, 2022		10,471,410
Treasury stock (in shares) at Dec. 31, 2022	(179,652)			(179,652)
Beginning balance at Dec. 31, 2022	$ 95,442	$ 1	87,809	$ (2,000)	9,632
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ 8,313
Ending balance (in shares) at Jun. 30, 2023		10,946,316
Treasury stock (in shares) at Jun. 30, 2023	(179,652)			(179,652)
Ending balance at Jun. 30, 2023	$ 105,658	$ 1	89,712	$ (2,000)	17,945
Beginning balance (in shares) at Mar. 31, 2023		10,732,955
Treasury stock (in shares) at Mar. 31, 2023				(179,652)
Beginning balance at Mar. 31, 2023	99,237	$ 1	88,611	$ (2,000)	12,625
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,101		1,101
Shares issued related to exercise of warrants (in shares)		213,361
Shares issued related to the exercise of warrants	0
Net (loss) income	$ 5,320				5,320
Ending balance (in shares) at Jun. 30, 2023		10,946,316
Treasury stock (in shares) at Jun. 30, 2023	(179,652)			(179,652)
Ending balance at Jun. 30, 2023	$ 105,658	$ 1	$ 89,712	$ (2,000)	$ 17,945

v3.23.2

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ 8,313	$ (650)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	3,859	4,148
Provision for credit losses / doubtful accounts	116	104
Stock-based compensation expense	2,234	1,174
Noncash operating lease expense	1,882	2,232
Amortization of debt issuance costs	58	65
Deferred income tax provision	(170)	(12)
Loss (gain) on sale of property and equipment	40	(111)
Loss on early termination of operating lease	0	849
Loss on change in fair value of contingent consideration	303	765
Loss on early debt extinguishment	311	0
Gain on change in fair value of interest rate swap	(37)	0
Changes in operating assets and liabilities:
Accounts receivable	37,096	(11,796)
Contract assets	2,029	8,904
Other current assets	(1,861)	(520)
Accounts payable, including retainage	(21,747)	(635)
Prepaid income taxes	(719)	(562)
Accrued taxes payable	(383)	(501)
Contract liabilities	(325)	13,123
Operating lease liabilities	(1,836)	(2,165)
Accrued expenses and other current liabilities	(1,806)	(1,861)
Payment of contingent consideration liability in excess of acquisition-date fair value	(1,224)	0
Other long-term liabilities	159	69
Net cash provided by operating activities	26,292	12,620
Cash flows from investing activities:
Proceeds from sale of property and equipment	275	189
Purchase of property and equipment	(1,499)	(473)
Net cash used in investing activities	(1,224)	(284)
Cash flows from financing activities:
Payments on Wintrust and A&R Wintrust Term Loans	(21,452)	(9,149)
Proceeds from Wintrust Revolving Loan	10,000	15,194
Payments on Wintrust Revolving Loan	0	(11,694)
Payment of contingent consideration liability up to acquisition-date fair value	(1,776)	0
Payments on finance leases	(1,302)	(1,358)
Payments of debt issuance costs	(50)	(25)
Taxes paid related to net-share settlement of equity awards	(847)	(363)
Proceeds from contributions to Employee Stock Purchase Plan	239	213
Net cash used in financing activities	(15,188)	(7,182)
Increase in cash, cash equivalents and restricted cash	9,880	5,154
Cash, cash equivalents and restricted cash, beginning of period	36,114	14,589
Cash, cash equivalents and restricted cash, end of period	45,994	19,743
Noncash investing and financing transactions:
Right of use assets obtained in exchange for new operating lease liabilities	742	0
Right of use assets obtained in exchange for new finance lease liabilities	3,392	1,968
Right of use assets disposed or adjusted modifying operating lease liabilities	0	(1,276)
Right of use assets disposed or adjusted modifying finance lease liabilities	(30)	(77)
Interest paid	1,181	911
Cash paid for income taxes	$ 3,919	$ 696

v3.23.2

Business and Organization	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	Business and OrganizationLimbach Holdings, Inc. (the “Company,” “we” or “us”), a Delaware corporation headquartered in Warrendale, Pennsylvania, was formed on July 20, 2016 as a result of a business combination with Limbach Holdings LLC (“LHLLC”). The Company is a building systems solutions firm with expertise in the design, prefabrication, installation, management and maintenance of heating, ventilation, air-conditioning (“HVAC”), mechanical, electrical, plumbing and controls systems. The Company provides comprehensive facility services consisting of mechanical construction, full HVAC service and maintenance, energy audits and retrofits, engineering and design build services, constructability evaluation, equipment and materials selection, offsite/prefabrication construction, and the complete range of sustainable building solutions. The Company’s customers operate in diverse industries including, but not limited to, data centers and healthcare, industrial and light manufacturing, cultural and entertainment, higher education, and life science facilities. The Company operates primarily in the Northeast, Mid-Atlantic, Southeast and Midwest regions of the United States.The Company operates in two segments, (i) General Contractor Relationships (“GCR”), in which the Company generally manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services awarded to the Company by general contractors or construction managers, and (ii) Owner Direct Relationships (“ODR”), in which the Company performs owner direct projects and/or provides maintenance or service primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. This work is primarily performed under fixed price, modified fixed price, and time and material contracts over periods of typically less than two years.

v3.23.2

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Basis of Presentation References in these financial statements to the Company refer collectively to the accounts of Limbach Holdings, Inc. and its wholly-owned subsidiaries, including LHLLC, Limbach Facility Services LLC (“LFS”), Limbach Company LLC (“LC LLC”), Limbach Company LP, Harper Limbach LLC, Harper Limbach Construction LLC, Limbach Facility & Project Solutions LLC, Jake Marshall, LLC (“JMLLC”) and Coating Solutions, LLC (“CSLLC”) for all periods presented. All intercompany balances and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the requirements of Form 10-Q and Rule 8-03 of Regulation S-X for smaller reporting companies. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. Readers of this report should refer to the consolidated financial statements and the notes thereto included in the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on March 8, 2023. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements for assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, the reported amounts of revenue and expenses during the reported period, and the accompanying notes. Management believes that its most significant estimates and assumptions have been based on reasonable and supportable assumptions and the resulting estimates are reasonable for use in the preparation of the condensed consolidated financial statements. The Company’s significant estimates include estimates associated with revenue recognition on construction contracts, costs incurred through each balance sheet date, intangibles, property and equipment, fair value accounting for acquisitions, insurance reserves, fair value of contingent consideration arrangements and contingencies. If the underlying estimates and assumptions upon which the condensed consolidated financial statements are based change in the future, actual amounts may differ from those included in the accompanying condensed consolidated financial statements. Unaudited Interim Financial Information The accompanying interim Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Stockholders’ Equity and Condensed Consolidated Statements of Cash Flows for the periods presented are unaudited. Also, within the notes to the condensed consolidated financial statements, the Company has included unaudited information for these interim periods. These unaudited interim condensed consolidated financial statements have been prepared in accordance with GAAP. In the Company's opinion, the accompanying unaudited condensed consolidated financial statements contain all normal and recurring adjustments necessary for a fair statement of the Company’s financial position as of June 30, 2023, its results of operations and equity for the three and six months ended June 30, 2023 and 2022 and its cash flows for the six months ended June 30, 2023 and 2022. The results for the three and six months ended June 30, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023. The Condensed Consolidated Balance Sheet as of December 31, 2022 was derived from the Company's audited financial statements included in its Annual Report on Form 10-K filed with the SEC on March 8, 2023, but is presented as condensed and does not contain all of the footnote disclosures from the annual financial statements. Recently Adopted Accounting Standards In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial instruments, including trade receivables and off-balance sheet credit exposure. Under this guidance, an entity is required to consider a broader range of information to estimate expected credit losses, which may result in earlier recognition of losses. This ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The Company adopted ASU 2016-13 on January 1, 2023 using the modified retrospective method, whereby the guidance was applied prospectively as of the date of adoption and prior periods are not restated. The adoption of this ASU did not have a material impact on the Company's financial position or results of operations. The Company assessed the scope of its financial assets and determined that the guidance associated with ASU 2016-13 is relevant to its trade accounts receivable and contract assets, including retainage. The Company’s trade receivables include amounts from work completed in which it has billed or has an unconditional right to bill its customers. The majority of the Company’s trade receivables are contractually due in less than a year. The Company further assessed the guidance based on its segment portfolio of receivables. While the Company’s construction-type GCR and ODR financial assets are often in the same subset of customers and industries, the Company’s construction-type related project work is typically bonded and the customers to which they perform work are well-known, solvent and have no history of material receivable write-offs. On the contrary, the Company’s service-type work, in particular its ODR core service work, is smaller in nature and is usually more susceptible to customer write-offs. As such, there is greater risk of credit loss on the Company’s ODR-related service-type receivables. The Company’s contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The Company has policies and procedures in place where it reviews claims and change orders on a quarterly basis to determine legal entitlement and recoverability in accordance with ASC Topic 606. As such, the Company has determined the risk of credit loss on its contracts assets to be remote. The Company develops its allowances for credit losses, which represent an estimate of expected losses over the remaining contractual life of its ODR-related service-type receivables, using an aging method. Under the aging method, the Company assigns its accounts receivable to a level of delinquency and applies a loss rate to each class. Loss rates are determined based on historical loss experiences with customers, the consideration of a customer’s financial condition, current market economic conditions and a forecast of future economic conditions when appropriate. When the Company becomes aware of a customer's inability to meet its financial obligation, a specific reserve is recorded to reduce the receivable to the expected amount to be collected. As part of the Company’s analysis of expected credit losses, it may analyze receivables with customers on an individual basis in situations where such accounts receivables exhibit unique risk characteristics and are not expected to experience similar losses to the rest of their class. Recent Accounting Pronouncements The FASB has issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting in March 2020. This new guidance provides optional expedients for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform, on financial reporting. The risk of termination of the London Interbank Offered Rate (LIBOR), has caused regulators to undertake reference rate reform initiatives to identify alternative reference rates that are more observable or transaction based that are less susceptible to manipulation. ASU 2020-04 was effective between March 12, 2020 and December 31, 2022. However, in December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, extending the sunset date under Topic 848 from December 31, 2022 to December 31, 2024 to align the temporary accounting relief guidance with the expected LIBOR cessation date of June 30, 2023. In addition, in January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The amendments in this update refine the scope for certain optional expedients and exceptions for contract modifications and hedge accounting to apply to derivative contracts and certain hedging relationships affected by the discounting transition. As a result of ASU 2022-06, an entity may now elect to apply the amendments in this update from the beginning of an interim period beginning as of March 12, 2020, through December 31, 2024. The Company has evaluated the impact of adopting the reference rate reform guidance (both ASU 2020-04 and ASU 2021-01) on its consolidated financial statements and has determined that these pronouncements did not have a significant impact. As discussed in Note 5, the A&R Credit Agreement removed LIBOR as a benchmark rate and now utilizes SOFR (as defined in the A&R Credit Agreement) as its replacement. During the second quarter of 2023, the Company entered into the Second A&R Credit Agreement (as defined in Note 5), which also utilizes SOFR as a benchmark rate. In addition, the Company’s interest rate swap utilizes SOFR as its benchmark rate. In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity and amends the scope guidance for contracts in an entity's own equity. The ASU addresses how convertible instruments are accounted for in the calculation of diluted earnings per share by using the if-converted method. The guidance is effective for all entities for fiscal years beginning after March 31, 2024, albeit early adoption is permitted no earlier than fiscal years beginning after December 15, 2020. Management is currently assessing the impact of this pronouncement on its condensed consolidated financial statements.

v3.23.2

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers The Company generates revenue from construction type contracts, primarily consisting of fixed-price contracts, to deliver HVAC, plumbing, and electrical construction services to its customers. The duration of its contracts generally ranges from three months to two years. Revenue from fixed price contracts is recognized on the cost-to-cost method, measured by the relationship of total cost incurred to total estimated contract costs. Revenue from time and materials contracts is recognized as services are performed. The Company believes that its extensive experience in HVAC, plumbing, and electrical projects, and its internal cost review procedures during the bidding process, enable it to reasonably estimate costs and mitigate the risk of cost overruns on fixed price contracts. The Company generally invoices customers on a monthly basis, based on a schedule of values that breaks down the contract amount into discrete billing items. Costs and estimated earnings in excess of billings on uncompleted contracts are recorded as a contract asset until billable under the contract terms. Billings in excess of costs and estimated earnings on uncompleted contracts are recorded as a contract liability until the related revenue is recognizable. The Company classifies contract assets and liabilities that may be settled beyond one year from the balance sheet date as current, consistent with the length of time of the Company’s project operating cycle. Contract assets Contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The components of the contract asset balances as of the respective dates were as follows: (in thousands) June 30, 2023 December 31, 2022 Change Contract assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 34,006  $ 33,573  $ 433  Retainage receivable 25,418  27,880  (2,462)       Total contract assets $ 59,424  $ 61,453  $ (2,029) Retainage receivable represents amounts invoiced to customers where payments have been partially withheld, typically 10%, pending the completion of certain milestones, satisfaction of other contractual conditions or the completion of the project. Retainage agreements vary from project to project and balances could be outstanding for several months or years depending on a number of circumstances such as contract-specific terms, project performance and other variables that may arise as the Company makes progress towards completion. Contract assets represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Contract assets result when either: (1) the appropriate contract revenue amount has been recognized over time in accordance with ASC Topic 606, but a portion of the revenue recorded cannot be currently billed due to the billing terms defined in the contract, or (2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings. The current estimated net realizable value on such items as recorded in contract assets and contract liabilities in the condensed consolidated balance sheets was $19.8 million and $28.5 million as of June 30, 2023 and December 31, 2022, respectively. The Company currently anticipates that the majority of such amounts will be approved or executed within one year. The resolution of those claims and unapproved change orders that may require litigation or other forms of dispute resolution proceedings may delay the timing of billing beyond one year. Contract liabilities Contract liabilities include billings in excess of contract costs and provisions for losses. The components of the contract liability balances as of the respective dates were as follows: (in thousands) June 30, 2023 December 31, 2022 Change Contract liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 43,382  $ 43,806  $ (424) Provisions for losses 300  201  99        Total contract liabilities $ 43,682  $ 44,007  $ (325) Billings in excess of costs and estimated earnings on uncompleted contracts represent the excess of contract billings to date over the amount of contract costs and profits (or contract revenue) recognized to date. The balance may fluctuate depending on the timing of contract billings and the recognition of contract revenue. Provisions for losses are recognized in the condensed consolidated statements of operations at the uncompleted performance obligation level for the amount of total estimated losses in the period that evidence indicates that the estimated total cost of a performance obligation exceeds its estimated total revenue. The net (overbilling) underbilling position for contracts in process consisted of the following: (in thousands) June 30, 2023 December 31, 2022 Revenue earned on uncompleted contracts $ 739,788  $ 678,014  Less: Billings to date (749,164) (688,247)    Net (overbilling) underbilling $ (9,376) $ (10,233) (in thousands) June 30, 2023 December 31, 2022 Costs in excess of billings and estimated earnings on uncompleted contracts $ 34,006  $ 33,573  Billings in excess of costs and estimated earnings on uncompleted contracts (43,382) (43,806)    Net (overbilling) underbilling $ (9,376) $ (10,233) Revisions in Contract Estimates The Company recorded revisions in its contract estimates for certain GCR and ODR projects. During the three and six months ended June 30, 2023, the Company did not record any material gross profit write-ups or write-downs that had a net gross profit impact of $0.5 million or more. During the three and six months ended June 30, 2022, the Company recorded a material gross profit write-up on one GCR project for a total of $1.3 million that had a net gross profit impact of $0.5 million or more for both periods. Remaining Performance Obligations Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. The Company’s remaining performance obligations include projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions. As of June 30, 2023, the aggregate amount of the transaction prices allocated to the remaining performance obligations of the Company's GCR and ODR segment contracts were $260.2 million and $113.6 million, respectively. The Company currently estimates that 52% and 65% of its GCR and ODR remaining performance obligations as of June 30, 2023, respectively, will be recognized as revenue during the remainder of 2023, with the substantial majority of remaining performance obligations to be recognized within 24 months, although the timing of the Company's performance is not always under its control. Additionally, the difference between remaining performance obligations and backlog is due to the exclusion of a portion of the Company’s ODR agreements under certain contract types from the Company’s remaining performance obligations as these contracts can be canceled for convenience at any time by the Company or the customer without considerable cost incurred by the customer.

v3.23.2

Goodwill and Intangibles	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles Goodwill Goodwill was $11.4 million as of June 30, 2023 and December 31, 2022 and is entirely associated with the Company's ODR segment. The Company tests its goodwill and indefinite-lived intangible assets allocated to its reporting units for impairment annually on October 1, or more frequently if events or circumstances indicate that it is more likely than not that the fair value of its reporting units and indefinite-lived intangible assets are less than their carrying amount. The Company has the option to assess goodwill for possible impairment by performing a qualitative analysis to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessments results in a more-likely-than-not determination or if a qualitative assessment is not performed. The Company did not recognize any impairment charges on its goodwill or intangible assets during the three and six months ended June 30, 2023 and June 30, 2022. Intangible Assets Intangible assets are comprised of the following:      (in thousands) Gross carrying amount Accumulated amortization Net intangible assets, excluding goodwill June 30, 2023 Amortized intangible assets: Customer relationships – GCR – Jake Marshall $ 570  $ (127) $ 443  Customer relationships – ODR – Jake Marshall 3,050  (637) 2,413  Customer relationships – ODR – Limbach 4,710  (3,891) 819  Favorable leasehold interests – Limbach 190  (105) 85  Backlog – GCR – Jake Marshall 260  (260) —  Backlog – ODR – Jake Marshall 680  (680) —  Trade name – Jake Marshall 1,150  (295) 855  Total amortized intangible assets 10,610  (5,995) 4,615  Unamortized intangible assets: Trade name – Limbach(1) 9,960  —  9,960  Total unamortized intangible assets 9,960  —  9,960  Total amortized and unamortized assets, excluding goodwill $ 20,570  $ (5,995) $ 14,575  (1)    The Company has determined that its trade name has an indefinite useful life. The Limbach trade name has been in existence since the Company’s founding in 1901 and therefore is an established brand within the industry. (in thousands) Gross carrying amount Accumulated amortization Net intangible assets, excluding goodwill December 31, 2022       Amortized intangible assets:       Customer relationships – GCR – Jake Marshall $ 570  $ (87) $ 483  Customer relationships – ODR – Jake Marshall 3,050  (436) 2,614  Customer relationships – ODR – Limbach 4,710  (3,765) 945  Favorable leasehold interests – Limbach 190  (97) 93  Backlog – GCR – Jake Marshall 260  (178) 82  Backlog – ODR – Jake Marshall 680  (465) 215  Trade name – Jake Marshall 1,150  (202) 948  Total amortized intangible assets 10,610  (5,230) 5,380  Unamortized intangible assets: Trade name – Limbach 9,960  —  9,960  Total unamortized intangible assets 9,960  —  9,960  Total amortized and unamortized assets, excluding goodwill $ 20,570  $ (5,230) $ 15,340  Total amortization expense for the Company's definite-lived intangible assets was $0.4 million and $0.8 million for both the three and six months ended June 30, 2023 and 2022, respectively

v3.23.2

Debt	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Debt	DebtLong-term debt consists of the following obligations as of: (in thousands) June 30, 2023 December 31, 2022 A&R Wintrust Term Loan - term loan payable in quarterly installments of principal, plus interest through February 2026 —  21,453  Wintrust Revolving Loans 10,000  —  Finance leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 3.96% to 8.35% through 2027 6,961  4,954  Financing liability 5,351  5,351  Total debt 22,312  31,758  Less - Current portion of long-term debt (2,431) (9,564) Less - Unamortized discount and debt issuance costs (396) (666) Long-term debt $ 19,485  $ 21,528  Wintrust Term and Revolving Loans On February 24, 2021, LFS, LHLLC and the direct and indirect subsidiaries of LFS from time to time included as parties to the agreement (the “Wintrust Guarantors”) entered into a credit agreement (the “Wintrust Credit Agreement”) by and among LFS, LHLLC, Wintrust Guarantors, the lenders party thereto from time to time, Wheaton Bank & Trust Company, N.A., a subsidiary of Wintrust Financial Corporation (collectively, “Wintrust”), as administrative agent and L/C issuer, Bank of the West as documentation agent, M&T Bank as syndication agent, and Wintrust as lead arranger and sole book runner. In accordance with the terms of the Wintrust Credit Agreement, Lenders provided to LFS (i) a $30.0 million senior secured term loan (the “Wintrust Term Loan”); and (ii) a $25.0 million senior secured revolving credit facility with a $5.0 million sublimit for the issuance of letters of credit (the “Wintrust Revolving Loan” and, together with the Wintrust Term Loan, the “Wintrust Loans”). Proceeds of the Wintrust Loans were used to refinance certain existing indebtedness, finance working capital and other general corporate purposes and fund certain fees and expenses associated with the closing of the Wintrust Loans. The Wintrust Revolving Loan initially bore interest, at LFS’s option, at either LIBOR (with a 0.25% floor) plus 3.5% or a base rate (with a 3.0% floor) plus 0.50%, subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA (earnings before interest, income taxes, depreciation and amortization) of LFS and its subsidiaries for the most recently ended four fiscal quarters. The Wintrust Term Loan initially bore interest, at LFS’s option, at either LIBOR (with a 0.25% floor) plus 4.0% or a base rate (with a 3.0% floor) plus 1.00%, subject to a 50 (for LIBOR) or 75 (for base rate) basis point step-down based on the Senior Leverage Ratio (as defined below). LFS was initially required to make principal payments on the Wintrust Term Loan in $0.5 million installments on the last business day of each month commencing on March 31, 2021 with a final payment of all principal and interest not sooner paid on the Wintrust Term Loan due and payable on February 24, 2026. In conjunction with the Company's acquisitions of JMLLC and CSLLC (the “Jake Marshall Transaction”), the Company entered into an amendment to the Wintrust Credit Agreement (the “A&R Wintrust Credit Agreement”). In accordance with the terms of the A&R Credit Agreement, Lenders provided to LFS (i) a $35.5 million senior secured term loan (the “A&R Wintrust Term Loan”); and (ii) a $25 million senior secured revolving credit facility with a $5 million sublimit for the issuance of letters of credit (the “A&R Wintrust Revolving Loan” and, together with the Term Loan, the “A&R Wintrust Loans”). The overall Wintrust Term Loan commitment under the A&R Wintrust Credit Agreement was recast at $35.5 million in connection with the A&R Credit Agreement. A portion of the A&R Wintrust Term Loan commitment was used to fund the closing purchase price of the Jake Marshall Transaction. The A&R Credit Agreement was also amended to: (i) permit the Company to undertake the Jake Marshall Transaction, (ii) make certain adjustments to the covenants under the A&R Credit Agreement (which were largely done to make certain adjustments for the Jake Marshall Transaction), (iii) allow for the Earnout Payments (as defined in Note 7) under the Jake Marshall Transaction, and (iv) make other corresponding changes to the A&R Credit Agreement. The A&R Wintrust Revolving Loan bore interest, at LFS’s option, at either the Term SOFR (as defined in the A&R Credit Agreement) (with a 0.15% floor) plus 3.60%, 3.76% or 3.92% for a tenor of one month, three months or six months, respectively, or a base rate (as set forth in the A&R Credit Agreement) (with a 3.0% floor) plus 0.50%, subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA of LFS and its subsidiaries for the most recently ended four fiscal quarters (the “Senior Leverage Ratio”). The A&R Wintrust Term Loan bore interest, at LFS’s option, at either Term SOFR (with a 0.15% floor) plus 4.10%, 4.26% or 4.42% for a tenor of one month, three months or six months, respectively, or a base rate (with a 3.0% floor) plus 1.00%, subject to a 50 (for Term SOFR) or 75 (for base rate) basis point step-down based on the Senior Leverage Ratio. The A&R Wintrust Term Loan was payable through a combination of (i) monthly installments of approximately $0.6 million due on the last business day of each month commencing on December 31, 2021, (ii) annual Excess Cash Flow payments as defined in the A&R Wintrust Credit Agreement, which are due 120 days after the last day of the Company's fiscal year and (iii) Net Claim Proceeds from Legacy Claims as defined in the A&R Wintrust Credit Agreement. Subject to defaults and remedies under the A&R Credit Agreement, the final payment of all principal and interest not sooner paid on the A&R Wintrust Term Loan was due and payable on February 24, 2026. Subject to defaults and remedies under the A&R Credit Agreement, the A&R Wintrust Revolving Loan would have matured and become due and payable by LFS on February 24, 2026. During the second quarter of 2022, the Company made certain Excess Cash Flow and Net Claim Proceeds payments of $3.3 million and $2.1 million, respectively, which concurrently reduced the outstanding A&R Wintrust Term Loan balance. In addition, during the third quarter of 2022, the Company made a Net Claim Proceeds payment of $0.6 million, which was also applied against the outstanding A&R Wintrust Term Loan balance. The A&R Wintrust Loans were secured by (i) a valid, perfected and enforceable lien of the administrative agent on the ownership interests held by each of LFS and Wintrust Guarantors in their respective subsidiaries; and (ii) a valid, perfected and enforceable lien of the administrative agent on each of LFS and Wintrust Guarantors’ personal property, fixtures and real estate, subject to certain exceptions and limitations. Additionally, the re-payment of the A&R Wintrust Loans shall be jointly and severally guaranteed by each Wintrust Guarantor. The A&R Credit Agreement contained representations and warranties, covenants and events of default that are customary for facilities of this type, as more particularly described in the A&R Credit Agreement. The A&R Wintrust Loans also contain three financial maintenance covenants, including (i) a requirement to have as of the last day of each quarter for the senior leverage ratio of the Company and its subsidiaries not to exceed an amount beginning at 2.00 to 1.00, (ii) a fixed charge coverage ratio of not less than 1.20 to 1.00 as of the last day of each fiscal quarter, commencing with the fiscal quarter ending December 31, 2021, and (iii) no unfinanced capital expenditures, except for unfinanced capital expenditures in the ordinary course of business not exceeding in the aggregate $4.0 million during any fiscal year; and no default or event of default (as defined by the agreement) has occurred and is continuing, 50% of any portion of this annual limit, if not expended in the fiscal year for which it is permitted, may be carried over for expenditure in the next following fiscal year as stipulated by the agreement. LFS and its affiliates maintain various commercial and service relationships with certain members of the syndicate and their affiliates in the ordinary course of business. On May 5, 2022, the Company, LFS and LHLLC entered into a first amendment and waiver to the A&R Wintrust Credit Agreement (the “First Amendment to the A&R Wintrust Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent. The First Amendment to the A&R Wintrust Credit Agreement modifies certain definitions within the A&R Wintrust Credit Agreement, and make other corresponding changes, including: (i) the definition of “EBITDA” to allow for the recognition of certain restructuring charges and lease breakage costs not previously specified, (ii) the definition of “Excess Cash Flow” to exclude the aggregate amount of the Earnout Payments paid in cash, (iii) the definition of “Total Funded Debt” to exclude certain capitalized lease obligations for real estate based on the approval of each lender and (iv) the definition of “Disposition” to include a clause for the sale and leaseback of certain real property based on the approval of each lender. In July 2022, the Company entered into an interest rate swap agreement to manage the risk associated with a portion of its variable-rate long-term debt. The interest rate swap involves the exchange of fixed-rate and variable-rate payments without the exchange of the underlying notional amount on which the interest payments are calculated. The new swap agreement became effective on July 14, 2022 and will terminate on July 31, 2027. The notional amount of the swap agreement is $10.0 million with a fixed interest rate of 3.12%. If the one-month SOFR (as defined in the A&R Credit Agreement) is above the fixed rate, the counterparty pays the Company, and if the one-month SOFR is less than the fixed rate, the Company pays the counterparty, the difference between the fixed rate of 3.12% and one-month SOFR. The Company has not designated this instrument as a hedge for accounting purposes. As a result, the change in fair value of the derivative instrument is recognized directly in earnings on the Company's condensed consolidated statements of operations as a gain or loss on interest rate swap. Refer to Note 7 for further information regarding this interest rate swap. On September 28, 2022, the Company, LFS and LHLLC entered into a second amendment and waiver to the amended and restated Wintrust credit agreement (the “Second Amendment to the A&R Wintrust Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent. The Second Amendment to the A&R Wintrust Credit Agreement incorporates certain restricted payment provisions, among other things, to permit LFS to repurchase shares under the Company’s Share Repurchase Program (as defined in Note 6). On May 5, 2023, LFS, LHLLC and the direct and indirect subsidiaries of LFS from time to time included as parties to the agreement entered into the Second Amended and Restated Credit Agreement (the “Second A&R Credit Agreement”) with the lenders party thereto and Wintrust, as administrative agent, which amends and restates the A&R Wintrust Credit Agreement. In accordance with the Second A&R Credit Agreement (i) lenders provided to LFS a $50.0 million senior secured revolving credit facility with a $5.0 million sublimit for the issuance of letters of credit, an increase of $25.0 million over the A&R Wintrust Revolving Loan, with a maturity date of February 24, 2028 (the “Second A&R Wintrust Revolving Loan”), and (ii) LFS repaid the then outstanding principal balance of the A&R Wintrust Term Loan using proceeds of the Second A&R Wintrust Revolving Loan. Prior to the execution of this agreement, the Company repaid $9.6 million of the then outstanding balance under the A&R Term Loan with cash on hand. As a result of the early repayment of the A&R Wintrust Term Loan and certain changes to the members of the loan syndicate under the Second A&R Wintrust Credit Agreement, the Company wrote off approximately $0.3 million of unamortized debt issuance costs, which are reported as a loss on early debt extinguishment on the Company's condensed consolidated statements of operations. Prior to its repayment on May 5, 2023 and as of June 30, 2022, the interest rate in effect on the non-hedged portion of the A&R Wintrust Term Loan was 9.25% and 5.75%, respectively. For the period from April 1, 2023 through May 5, 2023 and from January 1, 2023 through May 5, 2023, the Company incurred interest on the A&R Wintrust Term Loan at a weighted average annual interest rate of 9.00% and 8.76%, respectively. For the three and six months ended June 30, 2022, the Company incurred interest on the A&R Wintrust Term Loan at a weighted average annual interest rate of 4.90% and 4.57%, respectively. The Second A&R Wintrust Revolving Loan bears interest, at LFS’s option, at either the Term SOFR (as defined in the Second A&R Credit Agreement) (with a 0.15% floor) plus 3.10% or the Prime Rate (as defined in the Second A&R Credit Agreement) (with a 3.0% floor), subject to a 50 basis point step-down based on the ratio between the senior debt of the Company and its subsidiaries to the EBITDA of LFS and its subsidiaries for the most recently ended four fiscal quarters. The Second A&R Wintrust Revolving Loan is secured by (i) a valid, perfected and enforceable lien of the administrative agent on the ownership interests held by each of LFS and Wintrust Guarantors in their respective subsidiaries; and (ii) a valid, perfected and enforceable lien of the administrative agent on each of LFS and Wintrust Guarantors’ personal property, fixtures and real estate, subject to certain exceptions and limitations. Additionally, the re-payment of the Second A&R Wintrust Revolving Loan is jointly and severally guaranteed by each Wintrust Guarantor. The Second A&R Credit Agreement contains representations and warranties, covenants and events of default that are customary for facilities of this type, as more particularly described in the Second A&R Credit Agreement. The Second A&R Wintrust Revolving Loan also contains three financial maintenance covenants, including (i) a requirement to have as of the last day of each quarter for the senior leverage ratio of LFS and its subsidiaries not to exceed an amount beginning at 2.00 to 1.00, (ii) a fixed charge coverage ratio of not less than 1.20 to 1.00 as of the last day of each fiscal quarter, commencing with the fiscal quarter ending March 31, 2023, and (iii) no unfinanced capital expenditures, except for unfinanced capital expenditures in the ordinary course of business not exceeding in the aggregate $4.0 million during any fiscal year; and no default or event of default (as defined in the Second A&R Credit Agreement) has occurred and is continuing, 50% of any portion of this annual limit, if not expended in the fiscal year for which it is permitted, may be carried over for expenditure in the next following fiscal year as stipulated by the agreement. As of June 30, 2023, the Company had $10.0 million in borrowings outstanding under the Second A&R Wintrust Revolving Loan. As of December 31, 2022, the Company had no borrowings outstanding under the A&R Wintrust Revolving Loan. During the three and six months ended June 30, 2023, the maximum outstanding borrowings under either the Company's revolving loan arrangements at any time was $10.0 million during both periods and the average daily balance was approximately $6.3 million and $3.1 million, respectively. For the three and six months ended June 30, 2023, the Company incurred interest on the Second A&R Wintrust Revolving Loan at a weighted average annual interest rate of 7.70% for both periods. During the three and six months ended June 30, 2022, the maximum outstanding borrowings under the A&R Wintrust Revolving Loan at any time was $3.5 million and $9.4 million, respectively, and the average daily balance was approximately $0.1 million for both periods. For the three and six months ended June 30, 2022, the Company incurred interest on the A&R Wintrust Revolving Loan at a weighted average annual interest rate of 4.91% and 4.37%, respectively. At June 30, 2023, the Company had irrevocable letters of credit in the amount of $4.2 million with its lender to secure obligations under its self-insurance program. The following is a summary of the applicable margin and commitment fees payable on the Second A&R Wintrust Revolving Loan credit commitment: Level Senior Leverage Ratio Applicable Margin for SOFR Revolver loans Applicable Margin for Prime Revolving loans Applicable Margin for commitment fee I Greater than 1.00 to 1.00 3.10  % —  % 0.25  % II Less than or equal to 1.00 to 1.00 2.60  % (0.50) % 0.25  % As of June 30, 2023, the Company was in compliance with all financial maintenance covenants as required by the A&R Wintrust Loans. Sale-Leaseback Financing Transaction On September 29, 2022, LC LLC and Royal Oak Acquisitions, LLC (the “Purchaser”) consummated the purchase of the real property under a sale and leaseback transaction, with an aggregate value of approximately $7.8 million (a purchase price of approximately $5.4 million and $2.4 million in tenant improvement allowances), pursuant to a purchase agreement under which the Purchaser purchased from LC LLC the Company’s facility and real property in Pontiac, MI (collectively, the “Pontiac Facility”). In connection with the sale and leaseback transaction, LC LLC and Featherstone St Pontiac MI LLC (the “Landlord”) entered into a Lease Agreement (the “Lease Agreement”), dated September 29, 2022 (the “Lease Effective Date”) for the Pontiac Facility. Commencing on the Lease Effective Date, pursuant to the Lease Agreement, LC LLC has leased the Pontiac Facility, subject to the terms and conditions of the Lease Agreement. The Lease Agreement provides for a term of 25 years (the “Primary Term”). The Lease Agreement also provides LC LLC with the option to extend the Primary Term by two separate renewal terms of five years each (each a “Renewal Term”). Under the terms of the Lease Agreement, the Company’s annual minimum rent is $499,730, payable in monthly installments, subject to annual increases of approximately 2.5% each year under the Primary Term and for each year under the Renewal Terms, if exercised. LC LLC has a one-time option to terminate the Lease Agreement effective on the last day of the fifteenth lease year by providing written notice to the Landlord as more fully set forth in the Lease Agreement. The one-time termination option of the Lease Agreement would require LC LLC to pay to the Landlord a termination fee of approximately $1.7 million. Pursuant to the terms and conditions set forth in the Lease Agreement, the Landlord has agreed to provide LC LLC with a tenant improvement allowance in an amount up to $2.4 million. LC LLC is responsible for the initial capital outlay and completion of the agreed upon improvement work. The Landlord will subsequently reimburse LC LLC for such items up to the stated allowance amount. The Company accounted for the sale and leaseback arrangement as a financing transaction in accordance with ASC Topic 842, “Leases,” as the Lease Agreement was determined to be a finance lease. The Company concluded the Lease Agreement met the qualifications to be classified as a finance lease due to the significance of the present value of the lease payments, using an implicit rate of 11.11% to reflect the Company’s incremental borrowing rate associated with the $5.4 million purchase price as of the Lease Agreement date, compared to the fair value of the Pontiac Facility. The implicit rate associated with the aggregate purchase value, inclusive of tenant improvement allowances, was 6.53% as of the Lease Agreement date. The presence of a finance lease indicates that control of the Pontiac Facility has not transferred to the Purchaser and, as such, the transaction was deemed a failed sale-leaseback and must be accounted for as a financing arrangement. As a result of this determination, the Company is viewed as having received the sale proceeds from the Purchaser in the form of a hypothetical loan collateralized by its leased facilities. The hypothetical loan is payable as principal and interest in the form of “lease payments” to the Purchaser. Principal repayments are recorded as a reduction to the financing liability. The Company will not derecognize the Pontiac Facility from its books for accounting purposes until the lease ends. No gain or loss was recognized under GAAP related to the sale and leaseback arrangement. As of June 30, 2023, the financing liability was $4.9 million, net of issuance costs, which was recognized within other long-term debt on the Company's condensed consolidated balance sheets. For the three and six months ended June 30, 2023, approximately $0.1 million and $0.2 million of interest expense associated with the financing was recognized.

v3.23.2

Equity	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Equity	EquityThe Company’s second amended and restated certificate of incorporation currently authorizes the issuance of 100,000,000 shares of common stock, par value $0.0001, and 1,000,000 shares of preferred stock, par value $0.0001. Warrants In conjunction with the Company's initial public offering, the Company issued Public Warrants, Private Warrants and $15 Exercise Price Sponsor Warrants. The Company issued certain Merger Warrants and Additional Merger Warrants in conjunction with the Company's business combination with LHLLC in July 2016 (the “Business Combination”). On July 20, 2021, the Public Warrants, Private Warrants, and Additional Merger Warrants expired by their terms. During the three months ended June 30, 2023, 600,000 $15 Exercise Price Sponsor Warrants and 163,444 Merger Warrants were exercised on a cashless basis by the holders of the warrants, which resulted in the warrants being converted into 167,564 and 45,797 shares of the Company's common stock, respectively. For the period from July 1, 2023 through July 20, 2023, the holders of the Merger Warrants exercised 443,032 warrants on a cashless basis, which resulted in the Merger Warrants being converted into 228,945 shares of the Company's common stock. The remaining 23,167 unexercised Merger Warrants expired by their terms on July 20, 2023. The following table summarizes the underlying shares of common stock with respect to outstanding warrants: June 30, 2023 December 31, 2022 $15 Exercise Price Sponsor Warrants(1)(2) —  600,000  Merger Warrants(3)(4) 466,199  629,643     Total 466,199  1,229,643  (1)    Exercisable for one share of common stock at an exercise price of $15.00 per share (“$15 Exercise Price Sponsor Warrants”). (2)    Issued under a warrant agreement dated July 15, 2014, between Continental Stock Transfer and Trust Company, as warrant agent, and the Company. (3)    Exercisable for one share of common stock at an exercise price of $12.50 per share (“Merger Warrants”). (4)    Issued to the sellers of LHLLC. Incentive Plan Upon the consummation of the Company's Business Combination, the Company adopted an omnibus incentive plan (the “Omnibus Incentive Plan”) pursuant to which equity awards may be granted thereunder. On March 25, 2022, the Board of Directors approved certain amendments to the Company's Omnibus Incentive Plan (the “2022 Amended and Restated Omnibus Incentive Plan”) to increase the number of shares of the Company's common stock that may be issued pursuant to awards by 350,000, for a total of 2,600,000 shares, and extended the term of the plan so that it will expire on the tenth anniversary of the date the stockholders approve the 2022 Amended and Restated Omnibus Incentive Plan. The amendments were approved by the Company's stockholders at the Annual Meeting held on June 22, 2022. On March 29, 2023, the Board of Directors approved certain amendments to the Company's Omnibus Incentive Plan (the “2023 Amended and Restated Omnibus Incentive Plan”) to increase the number of shares of the Company's common stock that may be issued pursuant to awards by 450,000, for a total of 3,050,000 shares, and extended the term of the plan so that it will expire on the tenth anniversary of the date the stockholders approve the 2023 Amended and Restated Omnibus Incentive Plan. The amendments were acted upon by the Company's stockholders at the Annual Meeting held on June 22, 2023. See Note 13 for a discussion of the Company's management incentive plans for restricted stock units (“RSUs”) granted, vested, forfeited and remaining unvested. Share Repurchase Program In September 2022, the Company announced that its Board of Directors approved a share repurchase program (the “Share Repurchase Program”) to repurchase shares of its common stock for an aggregate purchase price not to exceed $2.0 million. The share repurchase authority is valid through September 29, 2023. Share repurchases may be executed through various means, including, without limitation, open market transactions, privately negotiated transactions or by other means in accordance with federal securities laws. The Share Repurchase Program does not obligate the Company to acquire any particular amount of common stock, and the program may be suspended or terminated by the Company at any time at its discretion without prior notice. As of June 30, 2023, the Company has made share repurchases of approximately $2.0 million under its Share Repurchase Program. Employee Stock Purchase Plan Upon approval of the Company's stockholders on May 30, 2019, the Company adopted the Limbach Holdings, Inc. 2019 Employee Stock Purchase Plan (the “ESPP”). On January 1, 2020, the ESPP went into effect. The ESPP enables eligible employees, as defined by the ESPP, the right to purchase the Company's common stock through payroll deductions during consecutive subscription periods at a purchase price of 85% of the fair market value of a common share at the end of each offering period. Annual purchases by participants are limited to the number of whole shares that can be purchased by an amount equal to ten percent of the participant's compensation or $5,000, whichever is less. Each offering period of the ESPP lasts six months, commencing on January 1 and July 1 of each year. The amounts collected from participants during a subscription period are used on the exercise date to purchase full shares of common stock. Participants may withdraw from an offering before the exercise date and obtain a refund of amounts withheld through payroll deductions. Compensation cost, representing the 15% discount applied to the fair market value of common stock, is recognized on a straight-line basis over the six-month vesting period during which employees perform related services. Under the ESPP, 500,000 shares are authorized to be issued. In January 2023, the Company issued 10,997 shares of its common stock to participants in the ESPP who contributed to the plan during the offering period ending December 31, 2022. In January 2022, the Company issued a total of 12,898 shares of its common stock, respectively, to participants in the ESPP who contributed to the plan during the offering periods ending December 31, 2021. As of June 30, 2023, 395,620 shares remain available for future issuance under the ESPP.

v3.23.2

Fair Value Measurements	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company measures the fair value of financial assets and liabilities in accordance with ASC Topic 820 – Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC Topic 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: •Level 1 — inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; •Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability either directly or indirectly such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities; and •Level 3 — unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company believes that the carrying amounts of its financial instruments, including cash and cash equivalents, trade accounts receivable and accounts payable, consist primarily of instruments without extended maturities, which approximate fair value primarily due to their short-term maturities and low risk of counterparty default. The Company considers all highly liquid investments purchased with a maturity of 90 days or less on the date of purchase to be cash equivalents. Cash equivalents as of June 30, 2023 consisted of overnight repurchase agreements in which cash from the Company's main operating checking account is invested overnight in highly liquid, short term investments, one U.S. Treasury Bill and certain investments in money market funds sponsored by a large financial institution. The Company had no such investments as of December 31, 2022. For the three and six months ending June 30, 2023, the Company recognized interest income of approximately $0.2 million associated with its overnight repurchase agreements, U.S. Treasury Bills and money market funds. The Company has not experienced any losses in its cash and cash equivalents and management believes the Company is not exposed to significant credit risk with respect to such accounts. Fair Value at Reporting Date Using (in thousands) June 30, 2023 Level 1 Level 2 Level 3 Cash equivalents: Overnight repurchase agreements $ 32,100  $ 32,100  U.S. Treasury Bills 5,000  5,000  $ —  $ —  Money market fund 3,750  3,750  —  —  Total $ 40,850  $ 40,850  $ —  $ —  Second A&R Wintrust Revolving Loan The Company also believes that the carrying value of the Second A&R Wintrust Revolving Loan approximates its respective fair value due to the variable rate on such debt. As of June 30, 2023, the Company determined that the fair value of the Second A&R Wintrust Revolving Loan was $10.0 million. Such fair value was determined using discounted estimated future cash flows using level 3 inputs. Earnout Payments As a part of the total consideration for the Jake Marshall Transaction, the former owners of JMLLC and CSLLC may receive up to an aggregate of $6.0 million in cash, consisting of two tranches of $3.0 million, as defined in the purchase agreement, if the gross profit of the acquired companies equals or exceeds $10.0 million in (i) the approximately 13 month period from closing through December 31, 2022 (the “2022 Earnout Period”) or (ii) fiscal year 2023 (the “2023 Earnout Period”), respectively (collectively, the “Earnout Payments”). To the extent, however, that the gross profit of the Acquired Companies is less than $10.0 million, but exceeds $8.0 million, during any of the 2022 Earnout Period or 2023 Earnout Period, the $3.0 million amount will be prorated for such period. The Company initially recognized $3.1 million in contingent consideration, of which the entire balance was included in other long-term liabilities in the Company’s condensed consolidated balance sheets on December 2, 2021. The fair value of contingent Earnout Payments is based on generating growth rates on the projected gross margins of the Acquired Entities and calculating the associated contingent payments based on achieving the earnout targets, which are reassessed each reporting period. In April 2023, the Company made a $3.0 million payment to the former owners of JMLLC and CSLLC related to the 2022 Earnout Period. Based on the Company’s ongoing assessment of the fair value of contingent earnout liabilities, the Company recorded a net increase in the estimated fair value of such liabilities of $0.2 million and $0.3 million for the three and six ended June 30, 2023, respectively, which was presented in change in fair value of contingent consideration in the Company's condensed consolidated statements of operations. During the three and six months ended June 30, 2022, the Company recorded a net increase in the estimated fair value of such liabilities of $0.8 million for both periods. The Company has assessed the estimated exposure to the contingent earnout liability for the 2023 Earnout Period to be approximately $2.7 million at June 30, 2023, which was included in accrued expenses and other current liabilities on the Company's condensed consolidated balance sheets. The Company determines the fair value of the Earnout Payments by utilizing the Monte Carlo Simulation method, which represents a Level 3 measurement. The Monte Carlo Simulation method models the probability of different financial results of the Acquired Entities during the earn-out period, utilizing a discount rate, which reflects a credit spread over the term-adjusted continuous risk-free rate. As of June 30, 2023 and 2022, the Earnout Payments associated with the Jake Marshall Transaction were valued utilizing a discount rate of 10.2% and 6.83%, respectively. The discount rate was calculated using the build-up method with a risk-free rate commensurate with the term of the Earnout Payments based on the U.S. Treasury Constant Maturity Yield. Interest Rate Swap The fair value of the interest rate swap is determined using widely accepted valuation techniques and reflects the contractual terms of the interest rate swap including the period to maturity, and while there are no quoted prices in active markets, it uses observable market-based inputs, including interest rate curves and implied volatilities. The fair value analysis also considers a credit valuation adjustment to reflect nonperformance risk of both the Company and the single counterparty. The fair value of the interest rate contract has been determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The interest rate swap is classified as a Level 2 item within the fair value hierarchy. As of June 30, 2023, the Company determined that the fair value of the interest rate swap was approximately $0.3 million and is recognized in other assets on the Company's condensed consolidated balance sheets. For the three and six months ended June 30, 2023, the Company recognized a gain of approximately $0.2 million and less than $0.1 million, respectively, on its condensed consolidated statements of operations associated with the change in fair value of the interest rate swap arrangement.

v3.23.2

Earnings per Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Earnings per Share The Company calculates earnings per share in accordance with ASC Topic 260 - Earnings Per Share (“EPS”). Basic earnings per common share applicable to common stockholders is computed by dividing earnings applicable to common stockholders by the weighted-average number of common shares outstanding and assumed to be outstanding. Diluted EPS assumes the dilutive effect of outstanding common stock warrants, shares issued in conjunction with the Company’s ESPP and RSUs, all using the treasury stock method. The following table sets forth the computation of the basic and diluted earnings per share attributable to the Company's common shareholders for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2023 2022 2023 2022 EPS numerator:     Net income (loss) $ 5,320  $ 866  $ 8,313  $ (650) EPS denominator: Weighted average shares outstanding – basic 10,644  10,423  10,560  10,422  Impact of dilutive securities(1) 863  144  776  —  Weighted average shares outstanding – diluted 11,507  10,567  11,336  10,422  EPS: Basic $ 0.50  $ 0.08  $ 0.79  $ (0.06) Diluted $ 0.46  $ 0.08  $ 0.73  $ (0.06) (1)    For the six months ended June 30, 2022, the Company excluded 150,420 of potentially dilutive securities related to certain of the Company's outstanding common stock warrants, shares issued in conjunction with the Company's ESPP and nonvested RSUs. These securities were excluded from the computation as their effect would have been anti-dilutive. As a result, the computations of net loss per share for the six months ended June 30, 2022 is the same for both basic and diluted. The following table summarizes the securities that were antidilutive or out-of-the-money, and therefore, were not included in the computations of diluted income per common share:   Three Months Ended June 30, Six Months Ended June 30,   2023 2022 2023 2022 Out-of-the-money warrants (see Note 6) —  1,229,643  —  1,229,643  Service-based RSUs (See Note 13) 1  17,595  26  72,871  Performance and market-based RSUs(1) 15  48,229  60  85,969  Employee Stock Purchase Plan 643  —  2,426  8,451  Total 659  1,295,467  2,512  1,396,934  (1)    For the three and six months ended June 30, 2022, certain MRSU awards (each defined in Note 13) were not included in the computation of diluted income per common share because the performance and market conditions were not satisfied during the periods and would not be satisfied if the reporting date was at the end of the contingency period.

v3.23.2

Income Taxes	6 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is taxed as a C corporation. For interim periods, the provision for income taxes (including federal, state, local and foreign taxes) is calculated based on the estimated annual effective tax rate, adjusted for certain discrete items for the full fiscal year. Cumulative adjustments to the Company's estimate are recorded in the interim period in which a change in the estimated annual effective rate is determined. Each quarter the Company updates its estimate of the annual effective tax rate, and if its estimated tax rate changes, the Company makes a cumulative adjustment. The following table presents our income tax provision and our income tax rate for the three and six months ended June 30, 2023 and 2022. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except percentages) 2023 2022 2023 2022 Income tax provision (benefit) $ 2,025  $ 237  $ 2,647  $ (379) Income tax rate 27.6  % 21.5  % 24.2  % 36.8  % The U.S. federal statutory tax rate was 21% for each of the three and six months ended June 30, 2023 and 2022. The difference between the U.S. federal statutory tax rate and the Company’s effective tax rate period over period was primarily due to state income taxes, tax credits, other permanent adjustments and discrete tax items. No valuation allowance was required as of June 30, 2023 or December 31, 2022.

v3.23.2

Operating Segments	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Operating Segments	Operating Segments As discussed in Note 1, the Company operates in two segments, (i) GCR, in which the Company generally manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services awarded to the Company by general contractors or construction managers, and (ii) ODR, in which the Company provides maintenance or service primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. These segments are reflective of how the Company’s Chief Operating Decision Maker (“CODM”) reviews operating results for the purposes of allocating resources and assessing performance. The Company's CODM is comprised of its President and Chief Executive Officer and Executive Vice President and Chief Financial Officer. In accordance with ASC Topic 280 – Segment Reporting, the Company has elected to aggregate all of the GCR work performed at branches into one GCR reportable segment and all of the ODR work performed at branches into one ODR reportable segment. All transactions between segments are eliminated in consolidation. On January 17, 2023, the Company announced its planned transition succession, pursuant to which Charles A. Bacon III stepped down as President and Chief Executive Officer on March 28, 2023, and Michael M. McCann, the Company’s former Executive Vice President and Chief Operating Officer, was appointed President and Chief Executive Officer. Following the transition, the Company revised its segment presentation to align with how Mr. McCann assesses performance and makes resource allocation decisions for its operating segments, which is based on segment revenue and segment gross profit. Selling, general and administrative ("SG&A") expenses are no longer reported on a segment basis as the Company's current CODM does not review discrete segment financial information for SG&A in order to assess performance. Interest expense is not allocated to segments because of the corporate management of debt service. The Company restated segment information for the historical periods presented herein to conform to the current presentation. This change in segment presentation does not affect the Company’s unaudited condensed consolidated statements of operations, balance sheets or statements of cash flows. All of the Company’s identifiable assets are located in the United States, which is where the Company is domiciled. Condensed consolidated segment information for the three and six months ended June 30, 2023 and 2022 were as follows:   Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Statement of Operations Data:     Revenue:     GCR $ 66,102  $ 66,336  $ 128,393  $ 138,268  ODR 58,780  49,784  117,498  92,674  Total revenue 124,882  116,120  245,891  230,942  Gross profit: GCR 11,272  8,694  21,590  17,052  ODR 17,241  12,626  33,150  22,608  Total gross profit 28,513  21,320  54,740  39,660  Selling, general and administrative(1) 20,416  18,690  41,466  37,424  Change in fair value of contingent consideration 162  765  303  765  Amortization of intangibles 383  399  766  798  Operating income $ 7,552  $ 1,466  $ 12,205  $ 673  Less unallocated amounts: Interest expense (511) (478) (1,178) (964) Interest income 247  —  247  —  Gain (loss) on disposition of property and equipment 175  147  (40) 111  Loss on early termination of operating lease —  (32) —  (849) Loss on early debt extinguishment (311) —  (311) —  Gain on change in fair value of interest rate swap 193  —  37  —  Total unallocated amounts (207) (363) (1,245) (1,702) Income (loss) before income taxes $ 7,345  $ 1,103  $ 10,960  $ (1,029) (1)    Included within selling, general and administrative expenses was $1.1 million and $0.6 million of stock based compensation expense for the three months ended June 30, 2023 and 2022, respectively. For the six month ended June 30, 2023 and 2022, selling, general and administrative expenses included $2.2 million and $1.2 million of stock based compensation expenses, respectively. The Company does not identify capital expenditures and total assets by segment in its internal financial reports due in part to the shared use of a centralized fleet of vehicles and specialized equipment. Interest expense is also not allocated to segments because of the Company’s corporate management of debt service, including interest.

v3.23.2

Leases	6 Months Ended
	Jun. 30, 2023
Leases [Abstract]
Leases	Leases The Company leases real estate, trucks and other equipment. The determination of whether an arrangement is, or contains, a lease is performed at the inception of the arrangement. Classification and initial measurement of the right-of-use asset and lease liability are determined at the lease commencement date. The Company elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheets. Instead, the short-term leases are recognized in expense on a straight-line basis over the lease term. The Company's arrangements include certain non-lease components such as common area and other maintenance for leased real estate, as well as mileage, fuel and maintenance costs related to leased vehicles. For all leased asset classes, the Company has elected to not separate non-lease components from lease components and will account for each separate lease component and non-lease component associated with the lease as a single lease component. The Company does not guarantee any residual value in its lease agreements, and there are no material restrictions or covenants imposed by lease arrangements. Real estate leases typically include one or more options to extend the lease. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term. For the Company's leased vehicles, the Company uses the interest rate implicit in its leases with the lessor to discount lease payments at the lease commencement date. When the implicit rate is not readily available, as is the case with the Company's real estate leases, the Company uses quoted borrowing rates on its secured debt. Related Party Lease Agreement. In conjunction with the closing of the Jake Marshall Transaction, the Company entered into an operating lease for certain land and facilities owned by a former member of JMLLC who became a full-time employee of the Company. The lease term is 10 years and includes an option to extend the lease for two successive periods of two years each through November 2035. Base rent for the term of the lease is $37,500 per month for the first five years with payment commencing on January 1, 2022. The fixed rent payment is escalated to $45,000 per month for years 6 through 10 of the lease term. Fixed rent payments for the extension term shall be increased from $45,000 by the percentage increase, if any, in the consumer price index from the lease commencement date. In addition, under the agreement, the Company is required to pay its share of estimated property taxes and operating expenses, both of which are variable lease expenses. Southern California Sublease. In June, 2021, the Company entered into a sublease agreement with a third party for the entire ground floor of its leased space in Southern California, consisting of 71,787 square feet. Under the terms of the sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.6 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The initial lease term commenced in September 2021 and continues through April 30, 2027. As of June 30, 2023, the Company remains obligated under the original lease for such office space and, in the event the sublessee of such office space fails to satisfy its obligations under the sublease, the Company would be required to satisfy its obligations directly to the landlord under such original lease. In addition, during the first quarter of 2022, the Company entered into an amendment to the aforementioned sublease agreement, which, among other things, expanded the sublease premises to include the entire second floor of its leased space in Southern California, consisting of 16,720 square feet. Under the terms of the amended sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.8 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The amended sublease term commenced in March 2022 and continues through April 30, 2027. For the three and six months ended June 30, 2023, the Company recorded approximately $0.3 million and $0.5 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement. For the three and six months ended June 30, 2022, the Company recorded approximately $0.2 million and $0.4 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement. Pittsburgh Lease Termination. In March, 2022, the Company entered into a lease termination agreement (the “Lease Termination Agreement”) to terminate, effective March 31, 2022, the lease associated with the Company’s office space located in Pittsburgh, Pennsylvania, which previously served as its corporate headquarters. Absent the Lease Termination Agreement, the lease would have expired in accordance with its terms in July 2025. Pursuant to the Lease Termination Agreement, in exchange for allowing the Company to terminate the lease early, the Company agreed to pay a termination fee in the aggregate of approximately $0.7 million in 16 equal monthly installments commencing on April 1, 2022. The Company recognized the full termination fee expense during the first quarter of 2022. In connection with the lease termination, the Company recognized a gain of $0.1 million associated with the derecognition of the operating lease right-of-use asset and corresponding operating lease liabilities associated with the operating lease and recorded a $0.1 million loss on the disposal of leasehold improvements and moving expenses. The following table summarizes the lease amounts included in the Company's condensed consolidated balance sheets: (in thousands) Classification on the Condensed Consolidated Balance Sheets June 30, 2023 December 31, 2022 Assets Operating Operating lease right-of-use assets(1) $ 17,149  $ 18,288  Finance Property and equipment, net(2)(3) 9,307  7,402  Total lease assets $ 26,456  $ 25,690  Liabilities Current    Operating Current operating lease liabilities $ 3,598  $ 3,562     Finance Current portion of long-term debt 2,431  2,135  Noncurrent    Operating Long-term operating lease liabilities 14,513  15,643     Finance Long-term debt(4) 9,881  8,170  Total lease liabilities $ 30,423  $ 29,510  (1)     Operating lease assets are recorded net of accumulated amortization of $11.7 million at June 30, 2023 and $12.2 million at December 31, 2022. (2)    Finance lease vehicle assets are recorded net of accumulated amortization of $5.1 million at June 30, 2023 and $6.0 million at December 31, 2022. (3)    Includes approximately $2.5 million and $2.6 million of net property assets associated with the Company's Pontiac Facility as of June 30, 2023 and December 31, 2022, respectively. (4)    Includes approximately $5.4 million associated with the Company's sale and leaseback financing transaction. See Note 5 for further detail. The following table summarizes the lease costs included in the Company's condensed consolidated statements of operations for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, (in thousands) Classification on the Condensed Consolidated Statement of Operations 2023 2022 2023 2022 Operating lease cost Cost of revenue(1) $ 522  $ 657  $ 1,083  $ 1,351  Operating lease cost Selling, general and administrative(1) 612  631  1,257  1,335  Finance lease cost    Amortization Cost of revenue(2) 667  685  1,298  1,336     Interest Interest expense, net(2) 86  66  152  132  Total lease cost $ 1,887  $ 2,039  $ 3,790  $ 4,154  (1)    Operating lease costs recorded in cost of revenue included $0.1 million of variable lease costs for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. In addition, $0.1 million of variable lease costs are included in selling, general and administrative for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. These variable costs consist of the Company's proportionate share of operating expenses, real estate taxes and utilities. (2)     Finance lease costs recorded in cost of revenue include variable lease costs of $0.9 million and $1.0 million for the three months ended June 30, 2023 and 2022, respectively, and $1.8 million for both the six months ended June 30, 2023 and 2022, respectively. These variable lease costs consist of fuel, maintenance, and sales tax charges. The future undiscounted minimum finance lease payments, as reconciled to the discounted minimum lease obligation indicated on the Company’s condensed consolidated balance sheets within current and long-term debt, less interest, and under current and long-term operating leases, less imputed interest, as of June 30, 2023 were as follows (in thousands): Finance Lease Obligations Operating Lease Obligations Year ending: Vehicles Pontiac Facility Total Finance Non-Related Party Related Party(1) Total Operating Sublease Receipts(2) Remainder of 2023 $ 1,501  $ 253  $ 1,754  $ 2,033  $ 225  $ 2,258  $ 448  2024 2,466  515  2,981  3,435  450  3,885  912  2025 1,922  528  2,450  2,928  450  3,378  939  2026 1,391  542  1,933  2,815  450  3,265  967  2027 483  555  1,038  1,842  540  2,382  326  Thereafter —  14,302  14,302  1,834  4,275  6,109  —  Total minimum lease payments 7,763  16,695  24,458  14,887  6,390  21,277  $ 3,593  Financing Component (3) (802) (11,343) (12,145) (1,686) (1,479) (3,165) Net present value of minimum lease payments 6,961  5,351  12,312  13,200  4,911  18,111  Less: current portion of finance and operating lease obligations (2,431) —  (2,431) (3,352) (246) (3,598) Long-term finance and operating lease obligations $ 4,530  $ 5,351  $ 9,881  $ 9,848  $ 4,665  $ 14,513  (1)    Associated with the aforementioned related party lease entered into with a former member of JMLLC. (2)    Associated with the aforementioned third party sublease. (3)     The financing component for finance lease obligations represents the interest component of finance leases that will be recognized as interest expense in future periods. The financing component for operating lease obligations represents the effect of discounting the lease payments to their present value. The following is a summary of the lease terms and discount rates as of: June 30, 2023 December 31, 2022 Weighted average lease term (in years):    Operating 6.68 6.98    Finance (1) 3.18 2.73 Weighted average discount rate:    Operating 4.88  % 4.76  %    Finance (1) 6.40  % 5.06  % (1)     Excludes the weighted average lease term and weighted average discount rate associated with the aforementioned sale-leaseback financing transaction, which has a Primary Term of 25 years and utilized an implicit rate of 11.11%. See Note 5 for further detail. The following is a summary of other information and supplemental cash flow information related to finance and operating leases: Six months ended June 30, (in thousands) 2023 2022 Cash paid for amounts included in the measurement of lease liabilities:    Operating cash flows from operating leases $ 2,294  $ 2,619     Operating cash flows from finance leases 152  132     Financing cash flows from finance leases 1,302  1,358  Right-of-use assets exchanged for lease liabilities:    Operating leases 742  —     Finance leases 3,392  1,968  Right-of-use assets disposed or adjusted modifying operating leases liabilities —  (1,276) Right-of-use assets disposed or adjusted modifying finance leases liabilities $ (30) (77)
Leases	Leases The Company leases real estate, trucks and other equipment. The determination of whether an arrangement is, or contains, a lease is performed at the inception of the arrangement. Classification and initial measurement of the right-of-use asset and lease liability are determined at the lease commencement date. The Company elected the short-term lease measurement and recognition exemption; therefore, leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheets. Instead, the short-term leases are recognized in expense on a straight-line basis over the lease term. The Company's arrangements include certain non-lease components such as common area and other maintenance for leased real estate, as well as mileage, fuel and maintenance costs related to leased vehicles. For all leased asset classes, the Company has elected to not separate non-lease components from lease components and will account for each separate lease component and non-lease component associated with the lease as a single lease component. The Company does not guarantee any residual value in its lease agreements, and there are no material restrictions or covenants imposed by lease arrangements. Real estate leases typically include one or more options to extend the lease. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period in its lease term. For the Company's leased vehicles, the Company uses the interest rate implicit in its leases with the lessor to discount lease payments at the lease commencement date. When the implicit rate is not readily available, as is the case with the Company's real estate leases, the Company uses quoted borrowing rates on its secured debt. Related Party Lease Agreement. In conjunction with the closing of the Jake Marshall Transaction, the Company entered into an operating lease for certain land and facilities owned by a former member of JMLLC who became a full-time employee of the Company. The lease term is 10 years and includes an option to extend the lease for two successive periods of two years each through November 2035. Base rent for the term of the lease is $37,500 per month for the first five years with payment commencing on January 1, 2022. The fixed rent payment is escalated to $45,000 per month for years 6 through 10 of the lease term. Fixed rent payments for the extension term shall be increased from $45,000 by the percentage increase, if any, in the consumer price index from the lease commencement date. In addition, under the agreement, the Company is required to pay its share of estimated property taxes and operating expenses, both of which are variable lease expenses. Southern California Sublease. In June, 2021, the Company entered into a sublease agreement with a third party for the entire ground floor of its leased space in Southern California, consisting of 71,787 square feet. Under the terms of the sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.6 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The initial lease term commenced in September 2021 and continues through April 30, 2027. As of June 30, 2023, the Company remains obligated under the original lease for such office space and, in the event the sublessee of such office space fails to satisfy its obligations under the sublease, the Company would be required to satisfy its obligations directly to the landlord under such original lease. In addition, during the first quarter of 2022, the Company entered into an amendment to the aforementioned sublease agreement, which, among other things, expanded the sublease premises to include the entire second floor of its leased space in Southern California, consisting of 16,720 square feet. Under the terms of the amended sublease agreement, the sublessee is obligated to pay the Company base rent of approximately $0.8 million per year, which is subject to a 3.0% annual rent increase, plus certain operating expenses and other costs. The amended sublease term commenced in March 2022 and continues through April 30, 2027. For the three and six months ended June 30, 2023, the Company recorded approximately $0.3 million and $0.5 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement. For the three and six months ended June 30, 2022, the Company recorded approximately $0.2 million and $0.4 million, respectively, of income in selling, general and administrative expenses related to this sublease agreement. Pittsburgh Lease Termination. In March, 2022, the Company entered into a lease termination agreement (the “Lease Termination Agreement”) to terminate, effective March 31, 2022, the lease associated with the Company’s office space located in Pittsburgh, Pennsylvania, which previously served as its corporate headquarters. Absent the Lease Termination Agreement, the lease would have expired in accordance with its terms in July 2025. Pursuant to the Lease Termination Agreement, in exchange for allowing the Company to terminate the lease early, the Company agreed to pay a termination fee in the aggregate of approximately $0.7 million in 16 equal monthly installments commencing on April 1, 2022. The Company recognized the full termination fee expense during the first quarter of 2022. In connection with the lease termination, the Company recognized a gain of $0.1 million associated with the derecognition of the operating lease right-of-use asset and corresponding operating lease liabilities associated with the operating lease and recorded a $0.1 million loss on the disposal of leasehold improvements and moving expenses. The following table summarizes the lease amounts included in the Company's condensed consolidated balance sheets: (in thousands) Classification on the Condensed Consolidated Balance Sheets June 30, 2023 December 31, 2022 Assets Operating Operating lease right-of-use assets(1) $ 17,149  $ 18,288  Finance Property and equipment, net(2)(3) 9,307  7,402  Total lease assets $ 26,456  $ 25,690  Liabilities Current    Operating Current operating lease liabilities $ 3,598  $ 3,562     Finance Current portion of long-term debt 2,431  2,135  Noncurrent    Operating Long-term operating lease liabilities 14,513  15,643     Finance Long-term debt(4) 9,881  8,170  Total lease liabilities $ 30,423  $ 29,510  (1)     Operating lease assets are recorded net of accumulated amortization of $11.7 million at June 30, 2023 and $12.2 million at December 31, 2022. (2)    Finance lease vehicle assets are recorded net of accumulated amortization of $5.1 million at June 30, 2023 and $6.0 million at December 31, 2022. (3)    Includes approximately $2.5 million and $2.6 million of net property assets associated with the Company's Pontiac Facility as of June 30, 2023 and December 31, 2022, respectively. (4)    Includes approximately $5.4 million associated with the Company's sale and leaseback financing transaction. See Note 5 for further detail. The following table summarizes the lease costs included in the Company's condensed consolidated statements of operations for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, (in thousands) Classification on the Condensed Consolidated Statement of Operations 2023 2022 2023 2022 Operating lease cost Cost of revenue(1) $ 522  $ 657  $ 1,083  $ 1,351  Operating lease cost Selling, general and administrative(1) 612  631  1,257  1,335  Finance lease cost    Amortization Cost of revenue(2) 667  685  1,298  1,336     Interest Interest expense, net(2) 86  66  152  132  Total lease cost $ 1,887  $ 2,039  $ 3,790  $ 4,154  (1)    Operating lease costs recorded in cost of revenue included $0.1 million of variable lease costs for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. In addition, $0.1 million of variable lease costs are included in selling, general and administrative for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. These variable costs consist of the Company's proportionate share of operating expenses, real estate taxes and utilities. (2)     Finance lease costs recorded in cost of revenue include variable lease costs of $0.9 million and $1.0 million for the three months ended June 30, 2023 and 2022, respectively, and $1.8 million for both the six months ended June 30, 2023 and 2022, respectively. These variable lease costs consist of fuel, maintenance, and sales tax charges. The future undiscounted minimum finance lease payments, as reconciled to the discounted minimum lease obligation indicated on the Company’s condensed consolidated balance sheets within current and long-term debt, less interest, and under current and long-term operating leases, less imputed interest, as of June 30, 2023 were as follows (in thousands): Finance Lease Obligations Operating Lease Obligations Year ending: Vehicles Pontiac Facility Total Finance Non-Related Party Related Party(1) Total Operating Sublease Receipts(2) Remainder of 2023 $ 1,501  $ 253  $ 1,754  $ 2,033  $ 225  $ 2,258  $ 448  2024 2,466  515  2,981  3,435  450  3,885  912  2025 1,922  528  2,450  2,928  450  3,378  939  2026 1,391  542  1,933  2,815  450  3,265  967  2027 483  555  1,038  1,842  540  2,382  326  Thereafter —  14,302  14,302  1,834  4,275  6,109  —  Total minimum lease payments 7,763  16,695  24,458  14,887  6,390  21,277  $ 3,593  Financing Component (3) (802) (11,343) (12,145) (1,686) (1,479) (3,165) Net present value of minimum lease payments 6,961  5,351  12,312  13,200  4,911  18,111  Less: current portion of finance and operating lease obligations (2,431) —  (2,431) (3,352) (246) (3,598) Long-term finance and operating lease obligations $ 4,530  $ 5,351  $ 9,881  $ 9,848  $ 4,665  $ 14,513  (1)    Associated with the aforementioned related party lease entered into with a former member of JMLLC. (2)    Associated with the aforementioned third party sublease. (3)     The financing component for finance lease obligations represents the interest component of finance leases that will be recognized as interest expense in future periods. The financing component for operating lease obligations represents the effect of discounting the lease payments to their present value. The following is a summary of the lease terms and discount rates as of: June 30, 2023 December 31, 2022 Weighted average lease term (in years):    Operating 6.68 6.98    Finance (1) 3.18 2.73 Weighted average discount rate:    Operating 4.88  % 4.76  %    Finance (1) 6.40  % 5.06  % (1)     Excludes the weighted average lease term and weighted average discount rate associated with the aforementioned sale-leaseback financing transaction, which has a Primary Term of 25 years and utilized an implicit rate of 11.11%. See Note 5 for further detail. The following is a summary of other information and supplemental cash flow information related to finance and operating leases: Six months ended June 30, (in thousands) 2023 2022 Cash paid for amounts included in the measurement of lease liabilities:    Operating cash flows from operating leases $ 2,294  $ 2,619     Operating cash flows from finance leases 152  132     Financing cash flows from finance leases 1,302  1,358  Right-of-use assets exchanged for lease liabilities:    Operating leases 742  —     Finance leases 3,392  1,968  Right-of-use assets disposed or adjusted modifying operating leases liabilities —  (1,276) Right-of-use assets disposed or adjusted modifying finance leases liabilities $ (30) (77)

v3.23.2

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal. The Company is continually engaged in administrative proceedings, arbitrations, and litigation with owners, general contractors, suppliers, employees, former employees and other unrelated parties, all arising in the ordinary courses of business. The ultimate resolution of these contingencies could, individually or in the aggregate, be material to the condensed consolidated financial statements. In the opinion of the Company’s management, the current belief is that the results of these actions will not have a material adverse effect on the financial position, results of operations, or cash flows of the Company. On January 23, 2020, plaintiff, Bernards Bros. Inc. (“Bernards”), filed a complaint against the Company in Superior Court of the State of California for the County of Los Angeles. The complaint alleges that the Company's Southern California business unit refused to honor a proposal made to Bernards to act as a subcontractor on a construction project, and that, as a result of the wrongful failure to honor the proposal, Bernards suffered damages in excess of $3.0 million plus interest, including alleged increased costs for hiring a different subcontractor to perform the work. The Company has vigorously defended the suit. Per the agreement of the Company and Bernards, in January 2022, the Court appointed a private referee to manage the case and adjudicate the dispute. A trial took place before the referee in January 2023, and on April 30, 2023, the referee issued an Amended Statement of Decision awarding Bernards approximately $2.2 million. As of December 31, 2022, the Company had determined that a loss was probable, and, as such, recorded an estimated loss contingency in the amount of $2.2 million, which is included in accrued expenses and other current liabilities reported within the Company’s consolidated balance sheets. In addition, the estimated loss contingency was recorded within selling, general and administrative expenses on the Company’s consolidated statements of operations and was presented within GCR selling, general and administrative expenses within the Company’s segment operations data. The Company is currently evaluating its options to appeal the referee's decisions. Surety. The terms of its construction contracts frequently require that the Company obtain from surety companies, and provide to its customers, payment and performance bonds (“Surety Bonds”) as a condition to the award of such contracts. The Surety Bonds secure the Company's payment and performance obligations under such contracts, and the Company has agreed to indemnify the surety companies for amounts, if any, paid by them in respect of Surety Bonds issued on its behalf. In addition, at the request of labor unions representing certain of the Company's employees, Surety Bonds are sometimes provided to secure obligations for wages and benefits payable to or for such employees. Public sector contracts require Surety Bonds more frequently than private sector contracts, and accordingly, the Company's bonding requirements typically increase as the amount of public sector work increases. As of June 30, 2023, the Company had approximately $117.5 million in surety bonds outstanding. The Surety Bonds are issued by surety companies in return for premiums, which vary depending on the size and type of bond. Collective Bargaining Agreements. Many of the Company’s craft labor employees are covered by collective bargaining agreements. The agreements require the Company to pay specified wages, provide certain benefits and contribute certain amounts to multi-employer pension plans. If the Company withdraws from any of the multi-employer pension plans or if the plans were to otherwise become underfunded, the Company could incur additional liabilities related to these plans. Although the Company has been informed that some of the multi-employer pension plans to which it contributes have been classified as “critical” status, the Company is not currently aware of any significant liabilities related to this issue. Self-insurance. The Company is substantially self-insured for workers’ compensation and general liability claims, in the view of the relatively high per-incident deductibles the Company absorbs under its insurance arrangements for these risks. The Company purchases workers’ compensation and general liability insurance under policies with per-incident deductibles of $250,000 per occurrence and a $4.4 million maximum aggregate deductible loss limit per year. Losses incurred over primary policy limits are covered by umbrella and excess policies up to specified limits with multiple excess insurers. The Company accrues for the unfunded portion of costs for both reported claims and claims incurred but not reported. The liability for unfunded reported claims and future claims is reflected on the consolidated balance sheets as current and non-current liabilities. The liability is determined by establishing a reserve for each reported claim on a case-by-case basis based on the nature of the claim and historical loss experience for similar claims plus an allowance for the cost of incurred but not reported claims. The current portion of the liability is included in accrued expenses and other current liabilities on the consolidated balance sheets. The non-current portion of the liability is included in other long-term liabilities on the consolidated balance sheets. The Company is self-insured related to medical and dental claims under policies with annual per-claimant and annual aggregate stop-loss limits. The Company accrues for the unfunded portion of costs for both reported claims and claims incurred but not reported. The liability for unfunded reported claims and future claims is reflected on the consolidated balance sheets as a current liability in accrued expenses and other current liabilities. The components of the self-insurance liability as of June 30, 2023 and December 31, 2022 are as follows: (in thousands) June 30, 2023 December 31, 2022 Current liability — workers’ compensation and general liability $ 67  $ 158  Current liability — medical and dental 433  557  Non-current liability 502  343  Total liability $ 1,002  $ 1,058  Restricted cash $ 65  $ 113  The restricted cash balance represents an imprest cash balance set aside for the funding of workers' compensation and general liability insurance claims. This amount is replenished either when depleted or at the beginning of each month.

v3.23.2

Management Incentive Plans	6 Months Ended
	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Management Incentive Plans	Management Incentive Plans The Company initially adopted the Omnibus Incentive Plan on July 20, 2016 for the purpose of: (a) encouraging the profitability and growth of the Company through short-term and long-term incentives that are consistent with the Company’s objectives; (b) giving participants an incentive for excellence in individual performance; (c) promoting teamwork among participants; and (d) giving the Company a significant advantage in attracting and retaining key employees, directors and consultants. To accomplish such purposes, the Omnibus Incentive Plan, and such subsequent amendments to the Omnibus Incentive Plan, provides that the Company may grant options, stock appreciation rights, restricted shares, RSUs, performance-based awards (including performance-based restricted shares and restricted stock units), other share based awards, other cash-based awards or any combination of the foregoing. Following the approval of the 2023 Amended and Restated Omnibus Incentive Plan, the Company has reserved 3,050,000 shares of its common stock for issuance. The number of shares issued or reserved pursuant to the Omnibus Incentive Plan will be adjusted by the plan administrator, as they deem appropriate and equitable, as a result of stock splits, stock dividends, and similar changes in the Company’s common stock. In connection with the grant of an award, the plan administrator may provide for the treatment of such award in the event of a change in control. All awards are made in the form of shares only. Service-Based Awards The Company grants service-based stock awards in the form of RSUs. Service-based RSUs granted to executives, employees, and non-employee directors vest ratably, on an annual basis, over three years and in the case of certain awards to non-employee directors, one year. The grant date fair value of the service-based awards was equal to the closing market price of the Company’s common stock on the date of grant. For both the three months ended June 30, 2023 and 2022, the Company recognized $0.3 million and $0.4 million, respectively, of stock-based compensation expense related to outstanding service-based RSUs. For the six months ended June 30, 2023 and 2022, the Company recognized $0.7 million of stock-based compensation expense related to outstanding service-based RSUs during both periods. The following table summarizes the Company's service-based RSU activity for the six months ended June 30, 2023:   Awards Weighted-Average Grant Date Fair Value Unvested at December 31, 2022 280,275  $ 9.06  Granted 162,369  11.77  Vested (163,354) 8.58  Forfeited (42,131) 10.63  Unvested at June 30, 2023 237,159  $ 10.97  Performance-Based Awards The Company grants performance-based restricted stock units (“PRSUs”) under which shares of the Company’s common stock may be earned based on the Company’s performance compared to defined metrics. The number of shares earned under a performance award may vary from zero to 150% of the target shares awarded, based upon the Company’s performance compared to the metrics. The metrics used for the grant are determined by the Company’s Compensation Committee of the Board of Directors and are based on internal measures such as the achievement of certain predetermined adjusted EBITDA, EPS growth and EBITDA margin performance goals over a three year period. The Company recognizes stock-based compensation expense for these awards over the vesting period based on the projected probability of achievement of the performance conditions as of the end of each reporting period during the performance period and may periodically adjust the recognition of such expense, as necessary, in response to any changes in the Company’s forecasts with respect to the performance conditions. For the three months ended June 30, 2023 and 2022, the Company recognized $0.8 million and $0.2 million, respectively, of stock-based compensation expense related to outstanding PRSUs. For the six months ended June 30, 2023 and 2022, the Company recognized $1.5 million and $0.4 million, respectively, of stock-based compensation expense related to outstanding PRSUs. The following table summarizes the Company's PRSU activity for the six months ended June 30, 2023:   Awards Weighted-Average Grant Date Fair Value Unvested at December 31, 2022 497,940  $ 8.32  Granted 285,005  12.60  Performance factor adjustment(1) 32,327  4.29  Vested (121,827) 4.29  Forfeited (116,911) 9.81  Unvested at June 30, 2023 576,534  $ 10.75  (1)     Performance-based awards covering the three year period ended December 31, 2022 were paid out in the first quarter of 2023 based on the approval of the Company's Compensation Committee. The performance factor during the measurement period used to determine compensation payouts was 136.13% of the pre-defined metric target of 100%, which resulted in a positive performance factor adjustment and the issuance of 32,327 of additional awards associated with the original grant. Market-Based Awards The vesting of the Company's market-based RSU (“MRSUs”) was contingent upon the Company’s closing price of a share of the Company's common stock on the Nasdaq Capital market, or such other applicable principal securities exchange or quotation system, achieving at least $18.00 over a period of eighty consecutive trading days during the three-year period commencing on August 1, 2018 and concluding on July 31, 2021. On September 4, 2020, the Compensation Committee of the Board of Directors of the Company approved amendments to modify the MRSUs to extend the measurement period to July 16, 2022. In addition to the market performance-based vesting condition, the vesting of such restricted stock unit was subject to continued employment from August 1, 2017 through the later of July 31, 2019 or the date on which the Compensation Committee certifies the achievement of the performance goal. The Company accounted for this amendment as a Type I modification and recognized approximately $0.2 million of incremental stock-based compensation expense over 1.26 years from the modification date based on an updated Monte Carlo simulation model. These awards expired on July 16, 2022 as the MRSU award market condition was not achieved. Stock-Based Compensation Expense Total recognized stock-based compensation expense amounted to $1.1 million and $0.6 million for the three months ended June 30, 2023 and 2022, respectively. For the six months ended June 30, 2023 and 2022, the Company recognized stock-based compensation expense of $2.2 million and $1.2 million, respectively. The aggregate fair value as of the vest date of RSUs that vested during the six months ended June 30, 2023 and 2022 was $3.4 million and $1.1 million, respectively. Total unrecognized stock-based compensation expense related to unvested RSUs which are probable of vesting was $4.4 million at June 30, 2023. These costs are expected to be recognized over a weighted average period of 1.83 years.

v3.23.2

Subsequent Events	6 Months Ended
	Jun. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn July 3, 2023, the Company completed an acquisition of Chattanooga, TN-based specialty industrial contractor, ACME Industrial Piping, LLC (“ACME”), for a purchase price at closing of $5 million in cash. The transaction also provides for an earnout of up to $2.5 million potentially being paid out over the next two years. ACME specializes in performing industrial maintenance, capital project work, and emergency services for specialty chemical and manufacturing clients, and is a leading mechanical solutions provider for hydroelectric producers.

v3.23.2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation References in these financial statements to the Company refer collectively to the accounts of Limbach Holdings, Inc. and its wholly-owned subsidiaries, including LHLLC, Limbach Facility Services LLC (“LFS”), Limbach Company LLC (“LC LLC”), Limbach Company LP, Harper Limbach LLC, Harper Limbach Construction LLC, Limbach Facility & Project Solutions LLC, Jake Marshall, LLC (“JMLLC”) and Coating Solutions, LLC (“CSLLC”) for all periods presented. All intercompany balances and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the requirements of Form 10-Q and Rule 8-03 of Regulation S-X for smaller reporting companies. Consequently, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. Readers of this report should refer to the consolidated financial statements and the notes thereto included in the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on March 8, 2023.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements for assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, the reported amounts of revenue and expenses during the reported period, and the accompanying notes. Management believes that its most significant estimates and assumptions have been based on reasonable and supportable assumptions and the resulting estimates are reasonable for use in the preparation of the condensed consolidated financial statements. The Company’s significant estimates include estimates associated with revenue recognition on construction contracts, costs incurred through each balance sheet date, intangibles, property and equipment, fair value accounting for acquisitions, insurance reserves, fair value of contingent consideration arrangements and contingencies. If the underlying estimates and assumptions upon which the condensed consolidated financial statements are based change in the future, actual amounts may differ from those included in the accompanying condensed consolidated financial statements.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying interim Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Stockholders’ Equity and Condensed Consolidated Statements of Cash Flows for the periods presented are unaudited. Also, within the notes to the condensed consolidated financial statements, the Company has included unaudited information for these interim periods. These unaudited interim condensed consolidated financial statements have been prepared in accordance with GAAP. In the Company's opinion, the accompanying unaudited condensed consolidated financial statements contain all normal and recurring adjustments necessary for a fair statement of the Company’s financial position as of June 30, 2023, its results of operations and equity for the three and six months ended June 30, 2023 and 2022 and its cash flows for the six months ended June 30, 2023 and 2022. The results for the three and six months ended June 30, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023. The Condensed Consolidated Balance Sheet as of December 31, 2022 was derived from the Company's audited financial statements included in its Annual Report on Form 10-K filed with the SEC on March 8, 2023, but is presented as condensed and does not contain all of the footnote disclosures from the annual financial statements.
Recently Adopted Accounting Standards and Recent Accounting Pronouncements	Recently Adopted Accounting Standards In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial instruments, including trade receivables and off-balance sheet credit exposure. Under this guidance, an entity is required to consider a broader range of information to estimate expected credit losses, which may result in earlier recognition of losses. This ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The Company adopted ASU 2016-13 on January 1, 2023 using the modified retrospective method, whereby the guidance was applied prospectively as of the date of adoption and prior periods are not restated. The adoption of this ASU did not have a material impact on the Company's financial position or results of operations. The Company assessed the scope of its financial assets and determined that the guidance associated with ASU 2016-13 is relevant to its trade accounts receivable and contract assets, including retainage. The Company’s trade receivables include amounts from work completed in which it has billed or has an unconditional right to bill its customers. The majority of the Company’s trade receivables are contractually due in less than a year. The Company further assessed the guidance based on its segment portfolio of receivables. While the Company’s construction-type GCR and ODR financial assets are often in the same subset of customers and industries, the Company’s construction-type related project work is typically bonded and the customers to which they perform work are well-known, solvent and have no history of material receivable write-offs. On the contrary, the Company’s service-type work, in particular its ODR core service work, is smaller in nature and is usually more susceptible to customer write-offs. As such, there is greater risk of credit loss on the Company’s ODR-related service-type receivables. The Company’s contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The Company has policies and procedures in place where it reviews claims and change orders on a quarterly basis to determine legal entitlement and recoverability in accordance with ASC Topic 606. As such, the Company has determined the risk of credit loss on its contracts assets to be remote. The Company develops its allowances for credit losses, which represent an estimate of expected losses over the remaining contractual life of its ODR-related service-type receivables, using an aging method. Under the aging method, the Company assigns its accounts receivable to a level of delinquency and applies a loss rate to each class. Loss rates are determined based on historical loss experiences with customers, the consideration of a customer’s financial condition, current market economic conditions and a forecast of future economic conditions when appropriate. When the Company becomes aware of a customer's inability to meet its financial obligation, a specific reserve is recorded to reduce the receivable to the expected amount to be collected. As part of the Company’s analysis of expected credit losses, it may analyze receivables with customers on an individual basis in situations where such accounts receivables exhibit unique risk characteristics and are not expected to experience similar losses to the rest of their class. Recent Accounting Pronouncements The FASB has issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting in March 2020. This new guidance provides optional expedients for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform, on financial reporting. The risk of termination of the London Interbank Offered Rate (LIBOR), has caused regulators to undertake reference rate reform initiatives to identify alternative reference rates that are more observable or transaction based that are less susceptible to manipulation. ASU 2020-04 was effective between March 12, 2020 and December 31, 2022. However, in December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, extending the sunset date under Topic 848 from December 31, 2022 to December 31, 2024 to align the temporary accounting relief guidance with the expected LIBOR cessation date of June 30, 2023. In addition, in January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The amendments in this update refine the scope for certain optional expedients and exceptions for contract modifications and hedge accounting to apply to derivative contracts and certain hedging relationships affected by the discounting transition. As a result of ASU 2022-06, an entity may now elect to apply the amendments in this update from the beginning of an interim period beginning as of March 12, 2020, through December 31, 2024. The Company has evaluated the impact of adopting the reference rate reform guidance (both ASU 2020-04 and ASU 2021-01) on its consolidated financial statements and has determined that these pronouncements did not have a significant impact. As discussed in Note 5, the A&R Credit Agreement removed LIBOR as a benchmark rate and now utilizes SOFR (as defined in the A&R Credit Agreement) as its replacement. During the second quarter of 2023, the Company entered into the Second A&R Credit Agreement (as defined in Note 5), which also utilizes SOFR as a benchmark rate. In addition, the Company’s interest rate swap utilizes SOFR as its benchmark rate. In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity, which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity and amends the scope guidance for contracts in an entity's own equity. The ASU addresses how convertible instruments are accounted for in the calculation of diluted earnings per share by using the if-converted method. The guidance is effective for all entities for fiscal years beginning after March 31, 2024, albeit early adoption is permitted no earlier than fiscal years beginning after December 15, 2020. Management is currently assessing the impact of this pronouncement on its condensed consolidated financial statements.
Revenue from Contract with Customers	Revenue from Contracts with Customers The Company generates revenue from construction type contracts, primarily consisting of fixed-price contracts, to deliver HVAC, plumbing, and electrical construction services to its customers. The duration of its contracts generally ranges from three months to two years. Revenue from fixed price contracts is recognized on the cost-to-cost method, measured by the relationship of total cost incurred to total estimated contract costs. Revenue from time and materials contracts is recognized as services are performed. The Company believes that its extensive experience in HVAC, plumbing, and electrical projects, and its internal cost review procedures during the bidding process, enable it to reasonably estimate costs and mitigate the risk of cost overruns on fixed price contracts. The Company generally invoices customers on a monthly basis, based on a schedule of values that breaks down the contract amount into discrete billing items. Costs and estimated earnings in excess of billings on uncompleted contracts are recorded as a contract asset until billable under the contract terms. Billings in excess of costs and estimated earnings on uncompleted contracts are recorded as a contract liability until the related revenue is recognizable. The Company classifies contract assets and liabilities that may be settled beyond one year from the balance sheet date as current, consistent with the length of time of the Company’s project operating cycle. Retainage receivable represents amounts invoiced to customers where payments have been partially withheld, typically 10%, pending the completion of certain milestones, satisfaction of other contractual conditions or the completion of the project. Retainage agreements vary from project to project and balances could be outstanding for several months or years depending on a number of circumstances such as contract-specific terms, project performance and other variables that may arise as the Company makes progress towards completion.Contract assets represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Contract assets result when either: (1) the appropriate contract revenue amount has been recognized over time in accordance with ASC Topic 606, but a portion of the revenue recorded cannot be currently billed due to the billing terms defined in the contract, or (2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings. Billings in excess of costs and estimated earnings on uncompleted contracts represent the excess of contract billings to date over the amount of contract costs and profits (or contract revenue) recognized to date. The balance may fluctuate depending on the timing of contract billings and the recognition of contract revenue. Provisions for losses are recognized in the condensed consolidated statements of operations at the uncompleted performance obligation level for the amount of total estimated losses in the period that evidence indicates that the estimated total cost of a performance obligation exceeds its estimated total revenue. Remaining Performance Obligations Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. The Company’s remaining performance obligations include projects that have a written award, a letter of intent, a notice to proceed or an agreed upon work order to perform work on mutually accepted terms and conditions. Additionally, the difference between remaining performance obligations and backlog is due to the exclusion of a portion of the Company’s ODR agreements under certain contract types from the Company’s remaining performance obligations as these contracts can be canceled for convenience at any time by the Company or the customer without considerable cost incurred by the customer.
Fair Value Measurements	The Company measures the fair value of financial assets and liabilities in accordance with ASC Topic 820 – Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC Topic 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value and requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to measurements involving significant unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows: •Level 1 — inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible at the measurement date; •Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability either directly or indirectly such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities; and •Level 3 — unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

v3.23.2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Components of Contract Asset and Liability Balances	Contract assets include amounts due under retainage provisions and costs and estimated earnings in excess of billings on uncompleted contracts. The components of the contract asset balances as of the respective dates were as follows: (in thousands) June 30, 2023 December 31, 2022 Change Contract assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 34,006  $ 33,573  $ 433  Retainage receivable 25,418  27,880  (2,462)       Total contract assets $ 59,424  $ 61,453  $ (2,029) Contract liabilities include billings in excess of contract costs and provisions for losses. The components of the contract liability balances as of the respective dates were as follows: (in thousands) June 30, 2023 December 31, 2022 Change Contract liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 43,382  $ 43,806  $ (424) Provisions for losses 300  201  99        Total contract liabilities $ 43,682  $ 44,007  $ (325)
Schedule of Contracts In Progress	The net (overbilling) underbilling position for contracts in process consisted of the following: (in thousands) June 30, 2023 December 31, 2022 Revenue earned on uncompleted contracts $ 739,788  $ 678,014  Less: Billings to date (749,164) (688,247)    Net (overbilling) underbilling $ (9,376) $ (10,233) (in thousands) June 30, 2023 December 31, 2022 Costs in excess of billings and estimated earnings on uncompleted contracts $ 34,006  $ 33,573  Billings in excess of costs and estimated earnings on uncompleted contracts (43,382) (43,806)    Net (overbilling) underbilling $ (9,376) $ (10,233)

v3.23.2

Goodwill and Intangibles (Tables)	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets are comprised of the following:      (in thousands) Gross carrying amount Accumulated amortization Net intangible assets, excluding goodwill June 30, 2023 Amortized intangible assets: Customer relationships – GCR – Jake Marshall $ 570  $ (127) $ 443  Customer relationships – ODR – Jake Marshall 3,050  (637) 2,413  Customer relationships – ODR – Limbach 4,710  (3,891) 819  Favorable leasehold interests – Limbach 190  (105) 85  Backlog – GCR – Jake Marshall 260  (260) —  Backlog – ODR – Jake Marshall 680  (680) —  Trade name – Jake Marshall 1,150  (295) 855  Total amortized intangible assets 10,610  (5,995) 4,615  Unamortized intangible assets: Trade name – Limbach(1) 9,960  —  9,960  Total unamortized intangible assets 9,960  —  9,960  Total amortized and unamortized assets, excluding goodwill $ 20,570  $ (5,995) $ 14,575  (1)    The Company has determined that its trade name has an indefinite useful life. The Limbach trade name has been in existence since the Company’s founding in 1901 and therefore is an established brand within the industry. (in thousands) Gross carrying amount Accumulated amortization Net intangible assets, excluding goodwill December 31, 2022       Amortized intangible assets:       Customer relationships – GCR – Jake Marshall $ 570  $ (87) $ 483  Customer relationships – ODR – Jake Marshall 3,050  (436) 2,614  Customer relationships – ODR – Limbach 4,710  (3,765) 945  Favorable leasehold interests – Limbach 190  (97) 93  Backlog – GCR – Jake Marshall 260  (178) 82  Backlog – ODR – Jake Marshall 680  (465) 215  Trade name – Jake Marshall 1,150  (202) 948  Total amortized intangible assets 10,610  (5,230) 5,380  Unamortized intangible assets: Trade name – Limbach 9,960  —  9,960  Total unamortized intangible assets 9,960  —  9,960  Total amortized and unamortized assets, excluding goodwill $ 20,570  $ (5,230) $ 15,340

v3.23.2

Debt (Tables)	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	Long-term debt consists of the following obligations as of: (in thousands) June 30, 2023 December 31, 2022 A&R Wintrust Term Loan - term loan payable in quarterly installments of principal, plus interest through February 2026 —  21,453  Wintrust Revolving Loans 10,000  —  Finance leases – collateralized by vehicles, payable in monthly installments of principal, plus interest ranging from 3.96% to 8.35% through 2027 6,961  4,954  Financing liability 5,351  5,351  Total debt 22,312  31,758  Less - Current portion of long-term debt (2,431) (9,564) Less - Unamortized discount and debt issuance costs (396) (666) Long-term debt $ 19,485  $ 21,528
Schedule of Additional Margin and Commitment Fees Payable	The following is a summary of the applicable margin and commitment fees payable on the Second A&R Wintrust Revolving Loan credit commitment: Level Senior Leverage Ratio Applicable Margin for SOFR Revolver loans Applicable Margin for Prime Revolving loans Applicable Margin for commitment fee I Greater than 1.00 to 1.00 3.10  % —  % 0.25  % II Less than or equal to 1.00 to 1.00 2.60  % (0.50) % 0.25  %

v3.23.2

Equity (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Schedule of Outstanding Warrants	The following table summarizes the underlying shares of common stock with respect to outstanding warrants: June 30, 2023 December 31, 2022 $15 Exercise Price Sponsor Warrants(1)(2) —  600,000  Merger Warrants(3)(4) 466,199  629,643     Total 466,199  1,229,643  (1)    Exercisable for one share of common stock at an exercise price of $15.00 per share (“$15 Exercise Price Sponsor Warrants”). (2)    Issued under a warrant agreement dated July 15, 2014, between Continental Stock Transfer and Trust Company, as warrant agent, and the Company. (3)    Exercisable for one share of common stock at an exercise price of $12.50 per share (“Merger Warrants”). (4)    Issued to the sellers of LHLLC.

v3.23.2

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements, Nonrecurring	Fair Value at Reporting Date Using (in thousands) June 30, 2023 Level 1 Level 2 Level 3 Cash equivalents: Overnight repurchase agreements $ 32,100  $ 32,100  U.S. Treasury Bills 5,000  5,000  $ —  $ —  Money market fund 3,750  3,750  —  —  Total $ 40,850  $ 40,850  $ —  $ —

v3.23.2

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of the basic and diluted earnings per share attributable to the Company's common shareholders for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2023 2022 2023 2022 EPS numerator:     Net income (loss) $ 5,320  $ 866  $ 8,313  $ (650) EPS denominator: Weighted average shares outstanding – basic 10,644  10,423  10,560  10,422  Impact of dilutive securities(1) 863  144  776  —  Weighted average shares outstanding – diluted 11,507  10,567  11,336  10,422  EPS: Basic $ 0.50  $ 0.08  $ 0.79  $ (0.06) Diluted $ 0.46  $ 0.08  $ 0.73  $ (0.06) (1)    For the six months ended June 30, 2022, the Company excluded 150,420 of potentially dilutive securities related to certain of the Company's outstanding common stock warrants, shares issued in conjunction with the Company's ESPP and nonvested RSUs. These securities were excluded from the computation as their effect would have been anti-dilutive. As a result, the computations of net loss per share for the six months ended June 30, 2022 is the same for both basic and diluted.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table summarizes the securities that were antidilutive or out-of-the-money, and therefore, were not included in the computations of diluted income per common share:   Three Months Ended June 30, Six Months Ended June 30,   2023 2022 2023 2022 Out-of-the-money warrants (see Note 6) —  1,229,643  —  1,229,643  Service-based RSUs (See Note 13) 1  17,595  26  72,871  Performance and market-based RSUs(1) 15  48,229  60  85,969  Employee Stock Purchase Plan 643  —  2,426  8,451  Total 659  1,295,467  2,512  1,396,934  (1)    For the three and six months ended June 30, 2022, certain MRSU awards (each defined in Note 13) were not included in the computation of diluted income per common share because the performance and market conditions were not satisfied during the periods and would not be satisfied if the reporting date was at the end of the contingency period.

v3.23.2

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Schedule of Income Tax Provision (Benefit)	The following table presents our income tax provision and our income tax rate for the three and six months ended June 30, 2023 and 2022. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except percentages) 2023 2022 2023 2022 Income tax provision (benefit) $ 2,025  $ 237  $ 2,647  $ (379) Income tax rate 27.6  % 21.5  % 24.2  % 36.8  %

v3.23.2

Operating Segments (Tables)	6 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Condensed Consolidated Segment Information	Condensed consolidated segment information for the three and six months ended June 30, 2023 and 2022 were as follows:   Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2023 2022 2023 2022 Statement of Operations Data:     Revenue:     GCR $ 66,102  $ 66,336  $ 128,393  $ 138,268  ODR 58,780  49,784  117,498  92,674  Total revenue 124,882  116,120  245,891  230,942  Gross profit: GCR 11,272  8,694  21,590  17,052  ODR 17,241  12,626  33,150  22,608  Total gross profit 28,513  21,320  54,740  39,660  Selling, general and administrative(1) 20,416  18,690  41,466  37,424  Change in fair value of contingent consideration 162  765  303  765  Amortization of intangibles 383  399  766  798  Operating income $ 7,552  $ 1,466  $ 12,205  $ 673  Less unallocated amounts: Interest expense (511) (478) (1,178) (964) Interest income 247  —  247  —  Gain (loss) on disposition of property and equipment 175  147  (40) 111  Loss on early termination of operating lease —  (32) —  (849) Loss on early debt extinguishment (311) —  (311) —  Gain on change in fair value of interest rate swap 193  —  37  —  Total unallocated amounts (207) (363) (1,245) (1,702) Income (loss) before income taxes $ 7,345  $ 1,103  $ 10,960  $ (1,029) (1)    Included within selling, general and administrative expenses was $1.1 million and $0.6 million of stock based compensation expense for the three months ended June 30, 2023 and 2022, respectively. For the six month ended June 30, 2023 and 2022, selling, general and administrative expenses included $2.2 million and $1.2 million of stock based compensation expenses, respectively.

v3.23.2

Leases (Tables)	6 Months Ended
	Jun. 30, 2023
Leases [Abstract]
Schedule of Supplemental Balance Sheets Information	The following table summarizes the lease amounts included in the Company's condensed consolidated balance sheets: (in thousands) Classification on the Condensed Consolidated Balance Sheets June 30, 2023 December 31, 2022 Assets Operating Operating lease right-of-use assets(1) $ 17,149  $ 18,288  Finance Property and equipment, net(2)(3) 9,307  7,402  Total lease assets $ 26,456  $ 25,690  Liabilities Current    Operating Current operating lease liabilities $ 3,598  $ 3,562     Finance Current portion of long-term debt 2,431  2,135  Noncurrent    Operating Long-term operating lease liabilities 14,513  15,643     Finance Long-term debt(4) 9,881  8,170  Total lease liabilities $ 30,423  $ 29,510  (1)     Operating lease assets are recorded net of accumulated amortization of $11.7 million at June 30, 2023 and $12.2 million at December 31, 2022. (2)    Finance lease vehicle assets are recorded net of accumulated amortization of $5.1 million at June 30, 2023 and $6.0 million at December 31, 2022. (3)    Includes approximately $2.5 million and $2.6 million of net property assets associated with the Company's Pontiac Facility as of June 30, 2023 and December 31, 2022, respectively. (4)    Includes approximately $5.4 million associated with the Company's sale and leaseback financing transaction. See Note 5 for further detail.
Schedule of Lease Costs, Lease Terms and Discount Rates	The following table summarizes the lease costs included in the Company's condensed consolidated statements of operations for the three and six months ended June 30, 2023 and 2022: Three Months Ended June 30, Six Months Ended June 30, (in thousands) Classification on the Condensed Consolidated Statement of Operations 2023 2022 2023 2022 Operating lease cost Cost of revenue(1) $ 522  $ 657  $ 1,083  $ 1,351  Operating lease cost Selling, general and administrative(1) 612  631  1,257  1,335  Finance lease cost    Amortization Cost of revenue(2) 667  685  1,298  1,336     Interest Interest expense, net(2) 86  66  152  132  Total lease cost $ 1,887  $ 2,039  $ 3,790  $ 4,154  (1)    Operating lease costs recorded in cost of revenue included $0.1 million of variable lease costs for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. In addition, $0.1 million of variable lease costs are included in selling, general and administrative for each of the three months ended June 30, 2023 and 2022, and $0.2 million for each of the six months ended June 30, 2023 and 2022. These variable costs consist of the Company's proportionate share of operating expenses, real estate taxes and utilities. (2)     Finance lease costs recorded in cost of revenue include variable lease costs of $0.9 million and $1.0 million for the three months ended June 30, 2023 and 2022, respectively, and $1.8 million for both the six months ended June 30, 2023 and 2022, respectively. These variable lease costs consist of fuel, maintenance, and sales tax charges. The following is a summary of the lease terms and discount rates as of: June 30, 2023 December 31, 2022 Weighted average lease term (in years):    Operating 6.68 6.98    Finance (1) 3.18 2.73 Weighted average discount rate:    Operating 4.88  % 4.76  %    Finance (1) 6.40  % 5.06  % (1)     Excludes the weighted average lease term and weighted average discount rate associated with the aforementioned sale-leaseback financing transaction, which has a Primary Term of 25 years and utilized an implicit rate of 11.11%. See Note 5 for further detail.
Schedule of Future Minimum Commitment for Finance Leases	(in thousands): Finance Lease Obligations Operating Lease Obligations Year ending: Vehicles Pontiac Facility Total Finance Non-Related Party Related Party(1) Total Operating Sublease Receipts(2) Remainder of 2023 $ 1,501  $ 253  $ 1,754  $ 2,033  $ 225  $ 2,258  $ 448  2024 2,466  515  2,981  3,435  450  3,885  912  2025 1,922  528  2,450  2,928  450  3,378  939  2026 1,391  542  1,933  2,815  450  3,265  967  2027 483  555  1,038  1,842  540  2,382  326  Thereafter —  14,302  14,302  1,834  4,275  6,109  —  Total minimum lease payments 7,763  16,695  24,458  14,887  6,390  21,277  $ 3,593  Financing Component (3) (802) (11,343) (12,145) (1,686) (1,479) (3,165) Net present value of minimum lease payments 6,961  5,351  12,312  13,200  4,911  18,111  Less: current portion of finance and operating lease obligations (2,431) —  (2,431) (3,352) (246) (3,598) Long-term finance and operating lease obligations $ 4,530  $ 5,351  $ 9,881  $ 9,848  $ 4,665  $ 14,513  (1)    Associated with the aforementioned related party lease entered into with a former member of JMLLC. (2)    Associated with the aforementioned third party sublease. (3)     The financing component for finance lease obligations represents the interest component of finance leases that will be recognized as interest expense in future periods. The financing component for operating lease obligations represents the effect of discounting the lease payments to their present value.
Schedule of Future Minimum Commitment for Operating Leases	The future undiscounted minimum finance lease payments, as reconciled to the discounted minimum lease obligation indicated on the Company’s condensed consolidated balance sheets within current and long-term debt, less interest, and under current and long-term operating leases, less imputed interest, as of June 30, 2023 were as follows (in thousands): Finance Lease Obligations Operating Lease Obligations Year ending: Vehicles Pontiac Facility Total Finance Non-Related Party Related Party(1) Total Operating Sublease Receipts(2) Remainder of 2023 $ 1,501  $ 253  $ 1,754  $ 2,033  $ 225  $ 2,258  $ 448  2024 2,466  515  2,981  3,435  450  3,885  912  2025 1,922  528  2,450  2,928  450  3,378  939  2026 1,391  542  1,933  2,815  450  3,265  967  2027 483  555  1,038  1,842  540  2,382  326  Thereafter —  14,302  14,302  1,834  4,275  6,109  —  Total minimum lease payments 7,763  16,695  24,458  14,887  6,390  21,277  $ 3,593  Financing Component (3) (802) (11,343) (12,145) (1,686) (1,479) (3,165) Net present value of minimum lease payments 6,961  5,351  12,312  13,200  4,911  18,111  Less: current portion of finance and operating lease obligations (2,431) —  (2,431) (3,352) (246) (3,598) Long-term finance and operating lease obligations $ 4,530  $ 5,351  $ 9,881  $ 9,848  $ 4,665  $ 14,513  (1)    Associated with the aforementioned related party lease entered into with a former member of JMLLC. (2)    Associated with the aforementioned third party sublease. (3)     The financing component for finance lease obligations represents the interest component of finance leases that will be recognized as interest expense in future periods. The financing component for operating lease obligations represents the effect of discounting the lease payments to their present value.
Schedule of Leases Supplemental Cash Flow Information	The following is a summary of other information and supplemental cash flow information related to finance and operating leases: Six months ended June 30, (in thousands) 2023 2022 Cash paid for amounts included in the measurement of lease liabilities:    Operating cash flows from operating leases $ 2,294  $ 2,619     Operating cash flows from finance leases 152  132     Financing cash flows from finance leases 1,302  1,358  Right-of-use assets exchanged for lease liabilities:    Operating leases 742  —     Finance leases 3,392  1,968  Right-of-use assets disposed or adjusted modifying operating leases liabilities —  (1,276) Right-of-use assets disposed or adjusted modifying finance leases liabilities $ (30) (77)

v3.23.2

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Components of Self-Insurance	The components of the self-insurance liability as of June 30, 2023 and December 31, 2022 are as follows: (in thousands) June 30, 2023 December 31, 2022 Current liability — workers’ compensation and general liability $ 67  $ 158  Current liability — medical and dental 433  557  Non-current liability 502  343  Total liability $ 1,002  $ 1,058  Restricted cash $ 65  $ 113

v3.23.2

Management Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2023
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes the Company's service-based RSU activity for the six months ended June 30, 2023:   Awards Weighted-Average Grant Date Fair Value Unvested at December 31, 2022 280,275  $ 9.06  Granted 162,369  11.77  Vested (163,354) 8.58  Forfeited (42,131) 10.63  Unvested at June 30, 2023 237,159  $ 10.97
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes the Company's PRSU activity for the six months ended June 30, 2023:   Awards Weighted-Average Grant Date Fair Value Unvested at December 31, 2022 497,940  $ 8.32  Granted 285,005  12.60  Performance factor adjustment(1) 32,327  4.29  Vested (121,827) 4.29  Forfeited (116,911) 9.81  Unvested at June 30, 2023 576,534  $ 10.75  (1)     Performance-based awards covering the three year period ended December 31, 2022 were paid out in the first quarter of 2023 based on the approval of the Company's Compensation Committee. The performance factor during the measurement period used to determine compensation payouts was 136.13% of the pre-defined metric target of 100%, which resulted in a positive performance factor adjustment and the issuance of 32,327 of additional awards associated with the original grant.

v3.23.2

Business and Organization (Details)	6 Months Ended
	Jun. 30, 2023 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	2
Service period	2 years

v3.23.2

Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Term of revenue contracts			three months to two years
Percentage completed of certain milestones			10.00%
Net amount of unresolved change orders and claims	$ 19,800		$ 19,800		$ 28,500
Total gross profits adjustments net		$ 1,300
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	24 months		24 months
GCR
Disaggregation of Revenue [Line Items]
Revision amount for gross profit impact on contract estimates (more than)	$ 500		$ 500	$ 500
GCR | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations, amount	$ 260,200		$ 260,200
Revenue, remaining performance obligations, percentage	52.00%		52.00%
Revenue, remaining performance obligations, expected timing of satisfaction, period	6 months		6 months
GCR | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligations, percentage	44.00%		44.00%
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year		1 year
ODR | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations, amount	$ 113,600		$ 113,600
Revenue, remaining performance obligations, percentage	65.00%		65.00%
Revenue, remaining performance obligations, expected timing of satisfaction, period	6 months		6 months
ODR | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligations, percentage	28.00%		28.00%
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year		1 year

v3.23.2

Revenue from Contracts with Customers - Schedule of Components of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Contract assets
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 34,006		$ 33,573
Retainage receivable	25,418		27,880
Total contract assets	59,424		61,453
Change in costs in excess of billings and estimated earnings	433
Change in retainage receivable	(2,462)
Change in total contract assets	(2,029)	$ (8,904)
Contract liabilities
Billings in excess of costs and estimated earnings on uncompleted contracts	43,382		43,806
Provisions for losses	300		201
Total contract liabilities	43,682		$ 44,007
Change in billings in excess of costs and estimated earnings	(424)
Change in provisions for losses	99
Change in total contract liabilities	$ (325)	$ 13,123

v3.23.2

Revenue from Contracts with Customers - Schedule of Contracts In Progress (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue earned on uncompleted contracts	$ 739,788	$ 678,014
Less: Billings to date	(749,164)	(688,247)
Net (overbilling) underbilling	(9,376)	(10,233)
Costs in excess of billings and estimated earnings on uncompleted contracts	34,006	33,573
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (43,382)	$ (43,806)

v3.23.2

Goodwill and Intangibles - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 11,370,000		$ 11,370,000		$ 11,370,000
Impairment of intangible assets (excluding goodwill)	0	$ 0	0	$ 0
Amortization of intangibles	$ 383,000	$ 399,000	$ 766,000	$ 798,000

v3.23.2

Goodwill and Intangibles - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized intangible assets:
Gross carrying amount	$ 10,610	$ 10,610
Accumulated amortization	(5,995)	(5,230)
Net intangible assets, excluding goodwill	4,615	5,380
Unamortized intangible assets:
Gross carrying amount	9,960	9,960
Net intangible assets, excluding goodwill	9,960	9,960
Gross carrying amount	20,570	20,570
Accumulated amortization	(5,995)	(5,230)
Total amortized and unamortized assets, excluding goodwill	14,575	15,340
Trade name – Jake Marshall
Unamortized intangible assets:
Gross carrying amount	9,960	9,960
Net intangible assets, excluding goodwill	9,960	9,960
Customer Relationships | GCR | Jake Marshall Transaction
Amortized intangible assets:
Gross carrying amount	570	570
Accumulated amortization	(127)	(87)
Net intangible assets, excluding goodwill	443	483
Unamortized intangible assets:
Accumulated amortization	(127)	(87)
Customer Relationships | ODR
Amortized intangible assets:
Gross carrying amount	4,710	4,710
Accumulated amortization	(3,891)	(3,765)
Net intangible assets, excluding goodwill	819	945
Unamortized intangible assets:
Accumulated amortization	(3,891)	(3,765)
Customer Relationships | ODR | Jake Marshall Transaction
Amortized intangible assets:
Gross carrying amount	3,050	3,050
Accumulated amortization	(637)	(436)
Net intangible assets, excluding goodwill	2,413	2,614
Unamortized intangible assets:
Accumulated amortization	(637)	(436)
Favorable Leasehold Interests
Amortized intangible assets:
Gross carrying amount	190	190
Accumulated amortization	(105)	(97)
Net intangible assets, excluding goodwill	85	93
Unamortized intangible assets:
Accumulated amortization	(105)	(97)
Backlog – Construction | GCR | Jake Marshall Transaction
Amortized intangible assets:
Gross carrying amount	260	260
Accumulated amortization	(260)	(178)
Net intangible assets, excluding goodwill	0	82
Unamortized intangible assets:
Accumulated amortization	(260)	(178)
Backlog – Construction | ODR | Jake Marshall Transaction
Amortized intangible assets:
Gross carrying amount	680	680
Accumulated amortization	(680)	(465)
Net intangible assets, excluding goodwill	0	215
Unamortized intangible assets:
Accumulated amortization	(680)	(465)
Trade name – Jake Marshall | Jake Marshall Transaction
Amortized intangible assets:
Gross carrying amount	1,150	1,150
Accumulated amortization	(295)	(202)
Net intangible assets, excluding goodwill	855	948
Unamortized intangible assets:
Accumulated amortization	$ (295)	$ (202)

v3.23.2

Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Net present value of minimum lease payments	$ 12,312
Total debt	22,312	$ 31,758
Less - Current portion of long-term debt	(2,431)	(9,564)
Less - Unamortized discount and debt issuance costs	(396)	(666)
Long-term debt	19,485	21,528
Vehicles
Debt Instrument [Line Items]
Net present value of minimum lease payments	6,961	4,954
Pontiac Facility
Debt Instrument [Line Items]
Net present value of minimum lease payments	$ 5,351	5,351
Minimum
Debt Instrument [Line Items]
Finance lease, discount rate	3.96%
Maximum
Debt Instrument [Line Items]
Finance lease, discount rate	8.35%
Secured Debt | A&R Wintrust Term Loan - term loan payable in quarterly installments of principal, plus interest through February 2026
Debt Instrument [Line Items]
Long term debt	$ 0	21,453
Revolving Credit Facility | Wintrust Revolving Loans
Debt Instrument [Line Items]
Long term debt	$ 10,000	$ 0

v3.23.2

Debt - Wintrust Term and Revolving Loans (Details)				3 Months Ended			6 Months Ended
	May 05, 2023 USD ($) covenant	Dec. 02, 2021 USD ($) covenant	Feb. 24, 2021 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jan. 01, 2023	Dec. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)
Interest Rate Swap
Debt Instrument [Line Items]
Notional amount											$ 10,000,000
Fixed interest rate											3.12%
Wintrust Term Loan
Debt Instrument [Line Items]
Debt effective interest rate	9.25%					5.75%		5.75%
Debt weighted average annual interest rate	8.76%								9.00%
Interest rate during period						4.90%		4.57%
A&R Wintrust Term And Revolving Loans
Debt Instrument [Line Items]
Number of financial covenants | covenant	3	3
Debt instrument, covenant compliance, leverage ratio	2.00	2.00
Debt instrument, covenant compliance, coverage ratio	1.20	1.20
Aggregate amount of unfinanced capital expenditures during any fiscal year	$ 0	$ 0
Limit annual percentage of unfinanced capital expenditures	50.00%	50.00%
Maximum outstanding borrowings during the period				$ 10,000,000		$ 3,500,000	$ 10,000,000	$ 9,400,000
Weighted average annual interest rate				7.70%		4.91%	7.70%	4.37%
A&R Wintrust Term And Revolving Loans | Maximum
Debt Instrument [Line Items]
Aggregate amount of unfinanced capital expenditures during any fiscal year	$ 4,000,000	$ 4,000,000
Amount drawn under credit agreement				$ 10,000,000			$ 10,000,000			$ 0
Average daily balance of borrowings outstanding				6,300,000			3,100,000	$ 100,000
Wintrust Loans
Debt Instrument [Line Items]
Letters of credit				$ 4,200,000			$ 4,200,000
Secured Debt | Wintrust Term Loan
Debt Instrument [Line Items]
Debt issued	50,000,000		$ 30,000,000
Debt installment payments			$ 500,000
Secured Debt | A&R Wintrust Term Loan
Debt Instrument [Line Items]
Debt installment payments		$ 600,000
Annual excess cash flow payments credit agreement period		120 days
Excess cash flow payments						$ 3,300,000
Net claim proceeds payments					$ 600,000	$ 2,100,000
Secured Debt | A&R Wintrust Term Loan | Jake Marshall Transaction
Debt Instrument [Line Items]
Debt issued		$ 35,500,000
Secured Debt | Revolving Credit Facility | Wintrust Revolving Loans | Jake Marshall Transaction
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		25,000,000
Secured Debt | Sublimit for Letters of Credit | Wintrust Revolving Loans | Jake Marshall Transaction
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	5,000,000	$ 5,000,000
Line of Credit | A&R Wintrust Term Loan | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Step-down adjustment on basis spread on variable rate		0.75%
Line of Credit | A&R Wintrust Term Loan | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%
Line of Credit | A&R Wintrust Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Step-down adjustment on basis spread on variable rate		0.50%
Line of Credit | A&R Wintrust Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate		4.26%
Line of Credit | A&R Wintrust Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Three
Debt Instrument [Line Items]
Basis spread on variable rate		4.42%
Line of Credit | A&R Wintrust Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate		4.10%
Line of Credit | A&R Wintrust Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.15%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | London Interbank Offered Rate (LIBOR) 1
Debt Instrument [Line Items]
Step-down adjustment on basis spread on variable rate			0.50%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | London Interbank Offered Rate (LIBOR) 1 | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			0.25%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | London Interbank Offered Rate (LIBOR) 1 | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			4.00%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | Base Rate
Debt Instrument [Line Items]
Step-down adjustment on basis spread on variable rate			0.75%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%
Line of Credit | Revolving Credit Facility | Wintrust Term Loan | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000		$ 25,000,000
Outstanding balance	9,600,000
Unamortized debt issuance costs	$ 300,000
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | London Interbank Offered Rate (LIBOR) 1 | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			0.25%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | London Interbank Offered Rate (LIBOR) 1 | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			3.50%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Step-down adjustment on basis spread on variable rate	5000.00%	0.50%	0.50%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%	3.00%	3.00%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two
Debt Instrument [Line Items]
Basis spread on variable rate		3.76%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Three
Debt Instrument [Line Items]
Basis spread on variable rate		3.92%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component One
Debt Instrument [Line Items]
Basis spread on variable rate		3.60%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.15%	0.15%
Line of Credit | Revolving Credit Facility | Wintrust Revolving Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	3.10%
Line of Credit | Sublimit for Letters of Credit | Wintrust Revolving Loans
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 5,000,000

v3.23.2

Debt - Additional Margin and Commitment Fees Payable (Details)	6 Months Ended
	Jun. 30, 2023
Level I
Debt Instrument [Line Items]
Senior Leverage Ratio	100.00%
Level I | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	0.25%
Level I | Secured Overnight Financing Rate (SOFR) | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	3.10%
Level I | Prime Rate | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	0.00%
Level II
Debt Instrument [Line Items]
Senior Leverage Ratio	100.00%
Level II | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	0.25%
Level II | Secured Overnight Financing Rate (SOFR) | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	2.60%
Level II | Prime Rate | Wintrust Revolving Loans
Debt Instrument [Line Items]
Additional margin for loans	(0.50%)

v3.23.2

Debt - Sale-Leaseback Financing Transactions (Details)		3 Months Ended	6 Months Ended
	Sep. 29, 2022 USD ($) renewalTerm	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
Purchase of property under sale and leaseback transaction	$ 7,800,000	$ 2,500,000	$ 2,500,000	$ 2,600,000
Purchase price	5,400,000
Tenant improvement allowance	$ 2,400,000
Lease agreement, term	25 years
Lease agreement, number of renewal terms | renewalTerm	2
Lease agreement, renewal term	5 years
Sale leaseback transaction, annual minimum rent	$ 499,730
Annual increase rate	2.50%
Termination fee	$ 1,700,000
Discount rate	11.11%
Tenant Improvement Allowance, implicit rate	6.53%
Sale leaseback transaction, gain or loss recognized			0
Finance lease liability		4,900,000	4,900,000
Financing interest expense		$ 100,000	$ 200,000

v3.23.2

Equity - Narrative (Details) - USD ($)					1 Months Ended		3 Months Ended	6 Months Ended
	Jul. 20, 2023	Mar. 29, 2023	Mar. 25, 2022	Jan. 01, 2020	Jan. 31, 2023	Jan. 31, 2022	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Class of Stock [Line Items]
Common stock, shares authorized (in shares)							100,000,000	100,000,000	100,000,000
Common stock, par or stated value per share (in usd per share)							$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)							1,000,000	1,000,000
Preferred stock, par or stated value per share (in usd per shares)							$ 0.0001	$ 0.0001
Class of warrant or right, outstanding (in shares)							466,199	466,199	1,229,643
Share Repurchase Program
Class of Stock [Line Items]
Repurchase of common stock										$ 2,000,000
Number of shares acquired (in shares)								2,000,000
2022 Amended And Restated Omnibus Incentive Plan
Class of Stock [Line Items]
Number of additional shares authorized under share-based compensation plan (in shares)			350,000
Common stock, capital shares reserved for future issuance (in shares)			2,600,000
2023 Amended And Restated Omnibus Incentive Plan
Class of Stock [Line Items]
Number of additional shares authorized under share-based compensation plan (in shares)		450,000
Common stock, capital shares reserved for future issuance (in shares)		3,050,000
ESPP | Employee Stock Purchase Plan
Class of Stock [Line Items]
Purchase price of common stock, percent of market price (no less than)				85.00%
Maximum employee subscription percentage				10.00%
Maximum contribution amount				$ 5,000
Offering period				6 months
Discount percentage from market price, beginning of purchase period				15.00%
Award vesting period				6 months
Number of shares authorized (in shares)				500,000
Shares issued (in shares)					10,997	12,898
Shares remaining available for future issuance (in shares)							395,620	395,620
$15 Exercise Price Sponsor Warrants
Class of Stock [Line Items]
Exercise price of warrants (in usd per share)							$ 15	$ 15	$ 15
Warrants redeemed (in shares)							600,000
Class of warrant or right, outstanding (in shares)							0	0	600,000
Merger Warrants
Class of Stock [Line Items]
Exercise price of warrants (in usd per share)							$ 12.50	$ 12.50	$ 12.50
Warrants redeemed (in shares)							163,444
Warrant converted into securities (in shares)							45,797	45,797
Class of warrant or right, outstanding (in shares)							466,199	466,199	629,643
Merger Warrants | Subsequent Event
Class of Stock [Line Items]
Warrants redeemed (in shares)	443,032
Warrant converted into securities (in shares)	228,945
Sponsor Warrant
Class of Stock [Line Items]
Warrant converted into securities (in shares)							167,564	167,564
unexercised Merger Warrants | Subsequent Event
Class of Stock [Line Items]
Class of warrant or right, outstanding (in shares)	23,167

v3.23.2

Equity - Schedule of Outstanding Warrants (Details) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Class of warrant or right, outstanding (in shares)	466,199	1,229,643
$15 Exercise Price Sponsor Warrants
Class of Stock [Line Items]
Class of warrant or right, outstanding (in shares)	0	600,000
Class of warrant or right, number of securities called by each warrant or right (in shares)	1	1
Exercise price of warrants (in usd per share)	$ 15	$ 15
Merger Warrants
Class of Stock [Line Items]
Class of warrant or right, outstanding (in shares)	466,199	629,643
Class of warrant or right, number of securities called by each warrant or right (in shares)	1	1
Exercise price of warrants (in usd per share)	$ 12.50	$ 12.50

v3.23.2

Fair Value Measurements - Schedule of Cash and Cash Equivalents (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 40,850
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	40,850
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
Overnight repurchase agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	32,100
Overnight repurchase agreements | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	32,100
Overnight repurchase agreements | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total
Overnight repurchase agreements | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total
U.S. Treasury Bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	5,000
U.S. Treasury Bills | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	5,000
U.S. Treasury Bills | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
U.S. Treasury Bills | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	3,750
Money market fund | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	3,750
Money market fund | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
Money market fund | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 0

v3.23.2

Fair Value Measurements - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 02, 2021 USD ($) payment	Apr. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment to former owners		$ 3,000
Change in fair value of contingent consideration			$ 162	$ 765	$ 303	$ 765
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on change in fair value of interest rate swap			200		100
Other Long-term Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the interest rate swap			300		300
Jake Marshall Transaction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout payments	$ 6,000
Change in fair value of contingent consideration			200	$ 800	300	$ 800
Jake Marshall Transaction | Earn Out Payment Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout payments	$ 3,000
Number of earnout tranches | payment	2
Earnout period	13 months
Jake Marshall Transaction | Earn Out Payment One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout payments	$ 3,000
Number of earnout tranches | payment	2
Earnout period	13 months
Jake Marshall Transaction | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout payments			2,700		2,700
Jake Marshall Transaction | Maximum | Earn Out Payment Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross profits from acquired companies	$ 10,000
Jake Marshall Transaction | Maximum | Earn Out Payment One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross profits from acquired companies	10,000
Jake Marshall Transaction | Minimum | Earn Out Payment Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross profits from acquired companies	8,000
Jake Marshall Transaction | Minimum | Earn Out Payment One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross profits from acquired companies	8,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognized interest income			$ 200		$ 200
Level 3 | Contingent Consideration Liability | Jake Marshall Transaction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of earnout payments	$ 3,100
Level 3 | Contingent Consideration Liability | Jake Marshall Transaction | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout payments, measurement input			0.102	0.0683	0.102	0.0683
Wintrust Term Loan | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt			$ 10,000		$ 10,000

v3.23.2

Earnings per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
EPS numerator:
Net income (loss)	$ 5,320	$ 2,993	$ 866	$ (1,516)	$ 8,313	$ (650)
EPS denominator:
Weighted average shares outstanding - basic (in shares)	10,644,423		10,423,068		10,560,381	10,421,886
Impact of dilutive securities (in shares)	863,000		144,000		776,000	0
Weighted average shares outstanding - diluted (in shares)	11,507,311		10,567,304		11,336,474	10,421,886
EPS:
Basic (in usd per share)	$ 0.50		$ 0.08		$ 0.79	$ (0.06)
Diluted (in usd per share)	$ 0.46		$ 0.08		$ 0.73	$ (0.06)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	659		1,295,467		2,512	1,396,934
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)						150,420

v3.23.2

Earnings per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	659	1,295,467	2,512	1,396,934
Out-of-the money warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0	1,229,643	0	1,229,643
Service-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1	17,595	26	72,871
Performance and market-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	15	48,229	60	85,969
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	643	0	2,426	8,451

v3.23.2

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ 2,025,000	$ 237,000	$ 2,647,000	$ (379,000)
Income tax rate	27.60%	21.50%	24.20%	36.80%
Valuation allowance	$ 0		$ 0		$ 0

v3.23.2

Operating Segments - Narrative (Details)	6 Months Ended
	Jun. 30, 2023 segment
Segment Reporting Information [Line Items]
Number of operating segments	2
GCR
Segment Reporting Information [Line Items]
Number of reportable segments	1
ODR
Segment Reporting Information [Line Items]
Number of reportable segments	1

v3.23.2

Operating Segments - Schedule of Condensed Consolidated Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 124,882	$ 116,120	$ 245,891	$ 230,942
Total gross profit	28,513	21,320	54,740	39,660
Selling, general and administrative	20,416	18,690	41,466	37,424
Change in fair value of contingent consideration	162	765	303	765
Amortization of intangibles	383	399	766	798
Operating income	7,552	1,466	12,205	673
Interest expense	(511)	(478)	(1,178)	(964)
Interest income	247	0	247	0
Gain (loss) on disposition of property and equipment	175	147	(40)	111
Loss on early termination of operating lease	0	(32)	0	(849)
Loss on early debt extinguishment	(311)	0	(311)	0
Gain on change in fair value of interest rate swap	193	0	37	0
Total unallocated amounts	(207)	(363)	(1,245)	(1,702)
Income (loss) before income taxes	7,345	1,103	10,960	(1,029)
Operating Segments | GCR
Segment Reporting Information [Line Items]
Revenue	66,102	66,336	128,393	138,268
Total gross profit	11,272	8,694	21,590	17,052
Operating Segments | ODR
Segment Reporting Information [Line Items]
Revenue	58,780	49,784	117,498	92,674
Total gross profit	17,241	12,626	33,150	22,608
Corporate
Segment Reporting Information [Line Items]
Selling, general and administrative	$ 1,100	$ 600	$ 2,200	$ 1,200

v3.23.2

Leases - Narrative (Details)		1 Months Ended		3 Months Ended			6 Months Ended
	Dec. 02, 2021 USD ($) extension	Mar. 31, 2022 USD ($) ft² installment	Jun. 30, 2021 USD ($) ft²	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) ft² installment	Jun. 30, 2023 USD ($) extension	Jun. 30, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Lease termination fee		$ 700,000
Lease termination fee payable, number of installments | installment		16				16
Gain on derecognition of lease assets and liabilities							$ 100,000
Loss on disposal of leasehold improvement							$ 100,000
Real Estate Leases
Lessee, Lease, Description [Line Items]
Number of lease extensions | extension							1
Office Building | Geographic Distribution, Domestic
Lessee, Lease, Description [Line Items]
Subleased area (in sq ft) | ft²		16,720	71,787			16,720
Sublease annual base rent			$ 600,000			$ 800,000
Sublease annual base rent increase percentage			3.00%			3.00%
Sublease income				$ 300,000	$ 200,000		$ 500,000	$ 400,000
Jake Marshall Transaction | Land and Building | Full Time Employee
Lessee, Lease, Description [Line Items]
Number of lease extensions | extension	2
Lease term	10 years
Term of lease extensions	2 years
Jake Marshall Transaction | Land and Building | Full Time Employee | Lease Contractual Term One
Lessee, Lease, Description [Line Items]
Lease term	5 years
Monthly base rent	$ 37,500
Jake Marshall Transaction | Land and Building | Full Time Employee | Lease Contractual Term Two
Lessee, Lease, Description [Line Items]
Lease term	5 years
Monthly base rent	$ 45,000

v3.23.2

Leases - Supplemental Balance Sheets Information (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Sep. 29, 2022
Leases [Abstract]
Operating lease right-of-use assets	$ 17,149	$ 18,288
Property, plant and equipment, net	9,307	7,402
Lease right-of-use assets	26,456	25,690
Less: current portion of finance and operating lease obligations	3,598	3,562
Less: current portion of finance and operating lease obligations	2,431	2,135
Long-term finance and operating lease obligations	14,513	15,643
Long-term finance and operating lease obligations	9,881	8,170
Total lease liabilities	30,423	29,510
Operating lease, accumulated amortization	11,700	12,200
Finance lease, accumulated amortization	5,100	6,000
Purchase of property under sale and leaseback transaction	2,500	$ 2,600	$ 7,800
Financing liability	$ 5,400
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt

v3.23.2

Leases - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lessee, Lease, Description [Line Items]
Finance lease cost, amortization	$ 667	$ 685	$ 1,298	$ 1,336
Finance lease cost, interest expense	86	66	152	132
Total lease cost	1,887	2,039	3,790	4,154
Cost of revenue
Lessee, Lease, Description [Line Items]
Operating lease cost	522	657	1,083	1,351
Cost of revenue | Operating Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	100	100	200	200
Cost of revenue | Finance Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	900	1,000	1,800	1,800
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	612	631	1,257	1,335
Selling, general and administrative expenses | Operating Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	$ 100	$ 100	$ 200	$ 200

v3.23.2

Leases - Future Minimum Lease Commitment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Finance Lease Obligations
Remainder of 2023	$ 1,754
2024	2,981
2025	2,450
2026	1,933
2027	1,038
Thereafter	14,302
Total minimum lease payments	24,458
Financing Component (3)	(12,145)
Net present value of minimum lease payments	12,312
Less: current portion of finance and operating lease obligations	(2,431)	$ (2,135)
Long-term finance and operating lease obligations	9,881	8,170
Operating Lease Obligations
Remainder of 2023	2,258
2024	3,885
2025	3,378
2026	3,265
2027	2,382
Thereafter	6,109
Total minimum lease payments	21,277
Financing Component	(3,165)
Net present value of minimum lease payments	18,111
Less: current portion of finance and operating lease obligations	(3,598)	(3,562)
Long-term finance and operating lease obligations	14,513	15,643
Sublease Receipts
Remainder of 2023	448
2024	912
2025	939
2026	967
2027	326
Thereafter	0
Total minimum lease payments	3,593
Non-Related Party
Operating Lease Obligations
Remainder of 2023	2,033
2024	3,435
2025	2,928
2026	2,815
2027	1,842
Thereafter	1,834
Total minimum lease payments	14,887
Financing Component	(1,686)
Net present value of minimum lease payments	13,200
Less: current portion of finance and operating lease obligations	(3,352)
Long-term finance and operating lease obligations	9,848
Related Party
Operating Lease Obligations
Remainder of 2023	225
2024	450
2025	450
2026	450
2027	540
Thereafter	4,275
Total minimum lease payments	6,390
Financing Component	(1,479)
Net present value of minimum lease payments	4,911
Less: current portion of finance and operating lease obligations	(246)
Long-term finance and operating lease obligations	4,665
Vehicles
Finance Lease Obligations
Remainder of 2023	1,501
2024	2,466
2025	1,922
2026	1,391
2027	483
Thereafter	0
Total minimum lease payments	7,763
Financing Component (3)	(802)
Net present value of minimum lease payments	6,961	4,954
Less: current portion of finance and operating lease obligations	(2,431)
Long-term finance and operating lease obligations	4,530
Pontiac Facility
Finance Lease Obligations
Remainder of 2023	253
2024	515
2025	528
2026	542
2027	555
Thereafter	14,302
Total minimum lease payments	16,695
Financing Component (3)	(11,343)
Net present value of minimum lease payments	5,351	$ 5,351
Less: current portion of finance and operating lease obligations	0
Long-term finance and operating lease obligations	$ 5,351

v3.23.2

Leases - Summary of Lease Terms and Discount Rates (Details)	Sep. 29, 2022	Jun. 30, 2023	Dec. 31, 2022
Weighted average lease term (in years):
Operating		6 years 8 months 4 days	6 years 11 months 23 days
Finance		3 years 2 months 4 days	2 years 8 months 23 days
Weighted average discount rate:
Operating		4.88%	4.76%
Finance		6.40%	5.06%
Lease agreement, term	25 years
Discount rate	11.11%

v3.23.2

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 2,294	$ 2,619
Operating cash flows from finance leases	152	132
Financing cash flows from finance leases	1,302	1,358
Operating leases	742	0
Finance leases	3,392	1,968
Right-of-use assets disposed or adjusted modifying operating leases liabilities	0	1,276
Right-of-use assets disposed or adjusted modifying finance leases liabilities	$ 30	$ 77

v3.23.2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands		4 Months Ended	6 Months Ended
	Jan. 23, 2020	Apr. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Loss estimated contingency				$ 2,200
Payment to acquire workers' compensation and general liability insurance			$ 250
Malpractice insurance, annual coverage limit			4,400
Surety Bond
Loss Contingencies [Line Items]
Debt outstanding			$ 117,500
Bernards Bros vs. Limbach Holdings, Inc.
Loss Contingencies [Line Items]
Issued an Amended Statement of Decision awarding		$ 2,200
Bernards Bros vs. Limbach Holdings, Inc. | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 3,000

v3.23.2

Commitments and Contingencies - Schedule of Components of Self-Insurance (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Current liability — workers’ compensation and general liability	$ 67	$ 158
Current liability — medical and dental	433	557
Non-current liability	502	343
Total liability	1,002	1,058
Restricted cash	$ 65	$ 113

v3.23.2

Management Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation	$ 1,100	$ 600	$ 2,234	$ 1,174
2021 Amended And Restated Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	3,050,000		3,050,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, vesting period			3 years
Recognized stock-based compensation	$ 300	400	$ 700	700
RSUs | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, vesting period			1 year
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, vesting period			3 years
Recognized stock-based compensation	800	$ 200	$ 1,500	400
PRSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to be issued under grant			0.00%
PRSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to be issued under grant			150.00%
Market-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target, price per share (in dollars per share)			$ 18.00
Number of consecutive trading days within performance period to meet target share price			80 days
Performance period			3 years
MRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based costs	200		$ 200
Weighted average period to recognize share-based costs			1 year 3 months 3 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based costs	$ 4,400		$ 4,400
Weighted average period to recognize share-based costs			1 year 9 months 29 days
Fair value of awards vested			$ 3,400	$ 1,100

v3.23.2

Management Incentive Plans - RSUs Activity (Details) - RSUs	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Awards
Unvested at December 31, 2022 (in shares) | shares	280,275
Granted (in shares) | shares	162,369
Vested (in shares) | shares	(163,354)
Forfeited (in shares) | shares	(42,131)
Unvested at March 31, 20223 (in shares) | shares	237,159
Weighted-Average Grant Date Fair Value
Unvested at December 31, 2022 (usd per share) | $ / shares	$ 9.06
Granted (usd per share) | $ / shares	11.77
Vested (usd per share) | $ / shares	8.58
Forfeited (usd per share) | $ / shares	10.63
Unvested at March 31, 2023 (usd per share) | $ / shares	$ 10.97

v3.23.2

Management Incentive Plans - PRSUs Activity (Details) - PRSUs - $ / shares	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Jun. 30, 2023
Awards
Unvested at December 31, 2022 (in shares)	497,940	497,940
Granted (in shares)		285,005
Performance factor adjustment (in shares)	32,327	32,327
Vested (in shares)		(121,827)
Forfeited (in shares)		(116,911)
Unvested at March 31, 20223 (in shares)		576,534
Weighted-Average Grant Date Fair Value
Unvested at December 31, 2022 (usd per share)	$ 8.32	$ 8.32
Granted (usd per share)		12.60
Performance factor adjustment (usd per share)		4.29
Vested (usd per share)		4.29
Forfeited (usd per share)		9.81
Unvested at March 31, 2023 (usd per share)		$ 10.75
Performance factor (percent)	136.13%
Pre-defined metric target, (percent)	100.00%

v3.23.2

Subsequent Events (Details) - ACME Industrial piping LLC - Subsequent Event $ in Millions	Jul. 03, 2023 USD ($)
Subsequent Event [Line Items]
Closing purchase price	$ 5.0
Earnout payments	$ 2.5
Earnout Period	2 years

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