Form 10-Q - Quarterly report [Sections 13 or 15(d)]

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2024

☐

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 000-30941

AXCELIS TECHNOLOGIES, INC.

(Exact name of registrant as specified in its charter)


Delaware		34-1818596
(State or other jurisdiction of incorporation or organization)		(IRS Employer Identification No.)

108 Cherry Hill Drive

Beverly, Massachusetts 01915

(Address of principal executive offices, including zip code)

(978) 787-4000

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading symbol	Name of each exchange on which registered
Common Stock, $0.001 par value	ACLS	Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐.

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.



Large accelerated filer ☒		Accelerated filer ☐
Non-accelerated filer ☐		Smaller reporting company ☐
		Emerging growth company ☐

If an emerging growth company, indicate by check mark if registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes ☐ No ☒

As of July 29, 2024, there were 32,617,587 shares of the registrant’s common stock outstanding.

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PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)
	Consolidated Statements of Operations for the three and six months ended June 30, 2024 and 2023	3
	Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2024 and 2023	4
	Consolidated Balance Sheets as of June 30, 2024 and December 31, 2023	5
	Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2024 and 2023	6
	Consolidated Statements of Cash Flows for the six months ended June 30, 2024 and 2023	7
	Notes to Consolidated Financial Statements (Unaudited)	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
	Overview	20
	Critical Accounting Estimates	20
	Results of Operations	21
	Liquidity and Capital Resources	27
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	27
Item 4.	Controls and Procedures	28
PART II - OTHER INFORMATION		29
Item 1.	Legal Proceedings	29
Item 1A.	Risk Factors	29
Item 2.	Unregistered Sales of Equity Securities, Use of Proceeds, and Issuer Purchases of Equity Securities	29
Item 3.	Defaults Upon Senior Securities	29
Item 4.	Mine Safety Disclosures	29
Item 5.	Other Information	29
Item 6.	Exhibits	30

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PART 1—FINANCIAL INFORMATION

Item 1. Financial Statements.

Axcelis Technologies, Inc.

Consolidated Statements of Operations

(In thousands, except per share amounts)

(Unaudited)


	Three months ended				Six months ended
		June 30,			June 30,
	2024		2023		2024		2023
Revenue:
Product	$	245,380	$	265,673	$	488,798	$	511,680
Services		11,132		8,297		20,085		16,310
Total revenue		256,512		273,970		508,883		527,990
Cost of revenue:
Product		134,759		146,741		262,670		289,512
Services		9,344		7,526		17,753		14,756
Total cost of revenue		144,103		154,267		280,423		304,268
Gross profit		112,409		119,703		228,460		223,722
Operating expenses:
Research and development		25,786		24,130		51,448		47,903
Sales and marketing		17,230		15,537		34,675		29,681
General and administrative		16,583		16,328		32,988		31,073
Total operating expenses		59,599		55,995		119,111		108,657
Income from operations		52,810		63,708		109,349		115,065
Other income (expense):
Interest income		6,051		4,307		11,566		8,243
Interest expense		(1,339)		(1,349)		(2,684)		(2,702)
Other, net		(257)		(2,050)		(1,968)		(3,088)
Total other income		4,455		908		6,914		2,453
Income before income taxes		57,265		64,616		116,263		117,518
Income tax provision		6,399		3,037		13,803		8,242
Net income	$	50,866	$	61,579	$	102,460	$	109,276
Net income per share:
Basic	$	1.56	$	1.88	$	3.14	$	3.34
Diluted	$	1.55	$	1.86	$	3.12	$	3.29
Shares used in computing net income per share:
Basic weighted average shares of common stock		32,598		32,775		32,618		32,759
Diluted weighted average shares of common stock		32,771		33,189		32,848		33,237

See accompanying Notes to these Consolidated Financial Statements (Unaudited)

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Axcelis Technologies, Inc.

Consolidated Statements of Comprehensive Income

(In thousands)

(Unaudited)


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023
Net income	$	50,866	$	61,579	$	102,460	$	109,276
Other comprehensive loss:
Foreign currency translation adjustments		(913)		(1,011)		(2,644)		(961)
Amortization of actuarial net gain and other adjustments from pension plan, net of tax		5		—		10		—
Total other comprehensive loss		(908)		(1,011)		(2,634)		(961)
Comprehensive income	$	49,958	$	60,568	$	99,826	$	108,315

See accompanying Notes to these Consolidated Financial Statements (Unaudited)

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Axcelis Technologies, Inc.

Consolidated Balance Sheets

(In thousands, except per share amounts)

(Unaudited)


	June 30,		December 31,
	2024		2023
ASSETS
Current assets:
Cash and cash equivalents	$	145,166	$	167,297
Short-term investments		403,143		338,851
Accounts receivable, net		188,080		217,964
Inventories, net		283,090		306,482
Prepaid income taxes		4,107		-
Prepaid expenses and other current assets		54,741		49,397
Total current assets		1,078,327		1,079,991
Property, plant and equipment, net		52,417		53,971
Operating lease assets		28,918		30,716
Finance lease assets, net		15,989		16,632
Long-term restricted cash		6,651		6,654
Deferred income taxes		55,441		53,428
Other assets		50,662		40,575
Total assets	$	1,288,405	$	1,281,967
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	45,782	$	54,400
Accrued compensation		16,069		31,445
Warranty		14,502		14,098
Income taxes		-		6,164
Deferred revenue		148,390		164,677
Current portion of finance lease obligation		1,452		1,511
Other current liabilities		17,984		12,834
Total current liabilities		244,179		285,129
Long-term finance lease obligation		43,004		43,674
Long-term deferred revenue		25,621		46,208
Other long-term liabilities		40,653		42,074
Total liabilities		353,457		417,085
Commitments and contingencies (Note 17)
Stockholders’ equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,617 shares issued and outstanding at June 30, 2024; 32,685 shares issued and outstanding at December 31, 2023		33		33
Additional paid-in capital		542,677		547,189
Retained earnings		396,718		319,506
Accumulated other comprehensive loss		(4,480)		(1,846)
Total stockholders’ equity		934,948		864,882
Total liabilities and stockholders’ equity	$	1,288,405	$	1,281,967

See accompanying Notes to these Consolidated Financial Statements (Unaudited)

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Axcelis Technologies, Inc.

Consolidated Statements of Stockholders’ Equity

(In thousands)

(Unaudited)


								Accumulated
				Additional				Other		Total
	Common Stock			Paid-in		Retained		Comprehensive		Stockholders’
	Shares	Amount		Capital		Earnings		(Loss)		Equity
Balance at December 31, 2022	32,775	$	33	$	550,299	$	118,892	$	(1,968)	$	667,256
Net income	—		—		—		47,697		—		47,697
Foreign currency translation adjustments	—		—		—		—		50		50
Exercise of stock options	2		—		25		—		—		25
Issuance of common stock on restricted stock units, net of shares withheld	56		—		(3,907)		—		—		(3,907)
Stock-based compensation expense	—		—		3,199		—		—		3,199
Repurchase of common stock	(107)		—		(1,924)		(10,575)		—		(12,499)
Balance at March 31, 2023	32,726	$	33	$	547,692	$	156,014	$	(1,918)	$	701,821

Net income	—		—		—		61,579		—		61,579
Foreign currency translation adjustments	—		—		—		—		(1,011)		(1,011)
Issuance of stock under Employee Stock Purchase Plan	6		—		957		—		—		957
Issuance of common stock on restricted stock units, net of shares withheld	199		—		(11,558)		—		—		(11,558)
Stock-based compensation expense	—		—		4,749				—		4,749
Repurchase of common stock	(95)		—		(1,720)		(10,780)		—		(12,500)
Balance at June 30, 2023	32,836	$	33	$	540,120	$	206,813	$	(2,929)	$	744,037


								Accumulated
				Additional				Other		Total
	Common Stock			Paid-in		Retained		Comprehensive		Stockholders’
	Shares	Amount		Capital		Earnings		(Loss)		Equity
Balance at December 31, 2023	32,685	$	33	$	547,189	$	319,506	$	(1,846)	$	864,882
Net income	—		—		—		51,595		—		51,595
Foreign currency translation adjustments	—		—		—		—		(1,731)		(1,731)
Change in pension obligation	—		—		—		—		5		5
Issuance of common stock on restricted stock units, net of shares withheld	42		—		(2,699)		—		—		(2,699)
Stock-based compensation expense	—		—		4,690		—		—		4,690
Repurchase of common stock	(122)		—		(2,201)		(12,798)		—		(14,999)
Balance at March 31, 2024	32,605	$	33	$	546,979	$	358,303	$	(3,572)	$	901,743

Net income	—		—		—		50,866		—		50,866
Foreign currency translation adjustments	—		—		—		—		(913)		(913)
Change in pension obligation	—		—		—		—		5		5
Issuance of stock under Employee Stock Purchase Plan	10		—		1,242		—		—		1,242
Issuance of common stock on restricted stock units, net of shares withheld	143		—		(8,468)		—		—		(8,468)
Stock-based compensation expense	—		—		5,469				—		5,469
Repurchase of common stock	(141)		—		(2,545)		(12,451)		—		(14,996)
Balance at June 30, 2024	32,617	$	33	$	542,677	$	396,718	$	(4,480)	$	934,948

See accompanying Notes to these Consolidated Financial Statements (Unaudited)

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Axcelis Technologies, Inc.

Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)


	Six months ended
	June 30,
	2024		2023
Cash flows from operating activities
Net income	$	102,460	$	109,276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		7,636		6,258
Deferred income taxes		(2,013)		(7,413)
Stock-based compensation expense		10,159		7,948
Provision for doubtful accounts		(459)		—
Provision for excess and obsolete inventory		2,846		2,494
Accretion of discounts and premiums on marketable securities		(6,623)		(5,753)
Currency loss on foreign denominated transactions		11,505		5,717
Changes in operating assets and liabilities:
Accounts receivable		25,009		8,173
Inventories		12,951		(63,294)
Prepaid expenses and other current assets		(5,849)		(5,095)
Accounts payable and other current liabilities		(18,541)		(18,266)
Deferred revenue		(35,957)		28,075
Income taxes		(8,391)		2,324
Other assets and liabilities		(12,443)		(3,170)
Net cash provided by operating activities		82,290		67,274

Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software		(3,624)		(5,202)
Purchase of short-term investments		(249,015)		(188,943)
Maturities of short-term investments		191,345		120,907
Net cash used in investing activities		(61,294)		(73,238)

Cash flows from financing activities
Net settlement on restricted stock grants		(11,167)		(15,465)
Repurchase of common stock		(29,995)		(24,999)
Proceeds from Employee Stock Purchase Plan purchases		1,242		957
Principal payments on finance lease obligation		(736)		(598)
Proceeds from exercise of stock options		—		25
Net cash used in financing activities		(40,656)		(40,080)

Effect of exchange rate changes on cash and cash equivalents		(2,474)		(1,147)
Net decrease in cash, cash equivalents and restricted cash		(22,134)		(47,191)

Cash, cash equivalents and restricted cash at beginning of period		173,951		186,347
Cash, cash equivalents and restricted cash at end of period	$	151,817	$	139,156

See accompanying Notes to these Consolidated Financial Statements (Unaudited)

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Axcelis Technologies, Inc.

Notes to Consolidated Financial Statements (Unaudited)

Note 1. Nature of Business

Axcelis Technologies, Inc. (“Axcelis” or the “Company”) was incorporated in Delaware in 1995 and is a producer of ion implantation equipment used in the fabrication of semiconductor chips in the United States, Europe and Asia. In addition, we provide extensive worldwide aftermarket service and support, including spare parts, equipment upgrades, used equipment, and maintenance services to the semiconductor industry.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments which are of a normal recurring nature and considered necessary for a fair presentation of these financial statements have been included. Operating results for the interim periods presented are not necessarily indicative of the results that may be expected for other interim periods or for the year as a whole.

The balance sheet at December 31, 2023 has been derived from the audited consolidated financial statements at that date but does not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. As of June 30, 2024, there have been no material changes in the Company’s significant accounting policies, other than with respect to the Company’s accounting policy for derivative financial instruments, which it had not held in prior periods, as described in Note 2 below. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, filed with the Securities and Exchange Commission (the “SEC”) on February 23, 2024, as amended by Amendment No. 1 thereto, filed with the SEC on February 28, 2024 (as so amended, the “2023 Form 10-K”).

Note 2. Significant Accounting Policies

Derivative instruments

We are exposed to certain risks relating to our ongoing business operations, including market risks relating to fluctuations in foreign currency exchange rates. We have entered into forward exchange contracts in order to mitigate risks associated with fluctuations in exchange rates on forecasted transactions denominated in foreign currencies and to minimize the impact of foreign currency fluctuations on our earnings and cash flows. These contracts have month-to-month settlement dates. As of June 30, 2024, we had open contracts with a notional value of $111 million. We measure these instruments at fair value and recognize assets or liabilities associated with the intrinsic value on these open contracts on the Consolidated Balance Sheets at the end of each reporting period. At June 30, 2024, the recognized unrealized loss on these forward exchange contracts was approximately $323 thousand. Unrealized gains and losses are shown in our cash flows from operating activities within our Consolidated Statement of Cash Flows. We have not designated these forward exchange contracts as hedging instruments and we record changes in the fair values at each measurement date in Other, net on the Consolidated Statements of Operations. For the three and six months ended June 30, 2024, we recorded $2.3 million and $3.8 million of gain on forward currency exchange contracts, respectively.

We do not offset fair value amounts of derivative instruments. We do not use derivative instruments for speculative purposes.

Note 3. Stock-Based Compensation

We maintain the Axcelis Technologies, Inc. 2012 Equity Incentive Plan, as amended (the “2012 Equity Plan”), which became effective on May 2, 2012, and permits the issuance of options, restricted stock, restricted stock units (“RSUs”) and performance awards to selected employees, directors, and consultants of the Company.

The 2012 Equity Plan is more fully described in Note 13 to the consolidated financial statements in our 2023 Form 10-K.

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We recognized stock-based compensation expense of $5.5 million and $4.7 million for the three-month periods ended June 30, 2024 and 2023, respectively. We recognized stock-based compensation expense of $10.2 million and $7.9 million for the six-month periods ended June 30, 2024 and 2023, respectively. These amounts include compensation expense related to RSUs, non-qualified stock options, and stock to be issued to participants under the 2020 Employee Stock Purchase Plan (the “2020 ESPP”).

In the three-month periods ended June 30, 2024 and 2023, respectively, we issued 0.2 million shares of common stock upon vesting of RSUs granted under the 2012 Equity Plan and purchases under the 2020 ESPP. In the three-month period ended June 30, 2024 and 2023, we received proceeds of $1.2 million and $1.0 million, respectively, from purchases under the 2020 ESPP.

In the six-month period ended June 30, 2024 and 2023, we issued 0.2 million and 0.3 million shares of common stock, respectively, upon vesting of RSUs granted under the 2012 Equity Plan and purchases under the 2020 ESPP. In the six-month period ended June 30, 2024 and 2023, we received proceeds of $1.2 million and $1.0 million, respectively, in connection with purchases under the 2020 ESPP.

Note 4. Leases

We have operating leases for manufacturing, office space, warehouse space, computer and office equipment and vehicles used in our business operations. We have a finance lease in relation to the 2015 sale-leaseback of our corporate headquarters in Beverly, Massachusetts. We review all agreements to determine if the agreement contains a lease component. An agreement contains a lease component if it provides for the use of a specific physical space or a specific physical item.

We recognize operating lease obligations under Accounting Standards Codification Topic 842, Leases (“Topic 842”). The guidance in Topic 842 requires recognition of lease assets and related liabilities on a discounted basis using the explicit or implicit discount rate stated within the agreement. We recognize a corresponding right-of-use asset, which is initially determined based upon the net present value of the associated liability and is adjusted for deferred costs and possible impairment, if any. For those lease agreements that do not indicate the applicable discount rate, we use our incremental borrowing rate. We have made the following policy elections: (i) operating leases with an initial term of 12 months or less are not recorded on the consolidated balance sheets; (ii) we recognize lease expense for operating leases on a straight-line basis over the lease term; and (iii) we account for lease components and non-lease components that are fixed payments as one component. Some of our operating leases include one or more options to renew, with renewal terms that can extend the respective lease term by one to three years. The exercise of lease renewal options is at our sole discretion. For lease extensions that are reasonably certain to occur, we have included the renewal periods in our calculation of the net present value of the lease obligation and related right-of-use asset. Certain leases also include options to purchase the leased property. The depreciable life of certain assets and leasehold improvements is limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. The amounts of operating and finance lease right-of-use assets and related lease obligations recorded within our consolidated balance sheets are as follows:

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		June 30,		December 31,
Leases	Classification	2024		2023

Assets		(in thousands)
Operating leases	Operating lease assets	$	28,918	$	30,716
Finance lease	Finance lease assets*		15,989		16,632
Total leased assets		$	44,907	$	47,348
Liabilities
Current
Operating	Other current liabilities	$	4,637	$	4,978
Finance	Current portion of finance lease obligation		1,452		1,511
Non-current
Operating	Other long-term liabilities		24,329		25,724
Finance	Finance lease obligation		43,004		43,674
Total lease liabilities		$	73,422	$	75,887

*Finance lease assets are recorded net of accumulated depreciation of $46.9 million and include $0.6 million of prepaid financing costs as of June 30, 2024. Finance lease assets are recorded net of accumulated depreciation of $46.4 million and include $0.6 million of prepaid financing costs as of December 31, 2023.

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All of our operating lease office locations support selling and servicing functions. Our Axcelis Asia Operations Center facility in South Korea brings production capability closer to our Asia-based customers. Our state-of-the-art 101,800 square foot logistics and flex manufacturing center was built to our specifications in Beverly, Massachusetts. Operating lease expense and depreciation and interest expense relating to our finance lease obligation are recognized within our Consolidated Statement of Operations for the three and six months ended June 30, 2024 and 2023 as follows:


		Three months ended				Six months ended
		June 30,				June 30,
Lease cost	Classification	2024		2023		2024		2023

Operating lease cost		(in thousands)
Product / services*	Cost of revenue	$	1,694	$	1,821	$	3,522	$	3,287
Research and development	Operating expenses		203		137		326		243
Sales and marketing*	Operating expenses		451		417		902		813
General and administrative*	Operating expenses		337		239		532		515
Total operating lease cost		$	2,685	$	2,614	$	5,282	$	4,858
Finance lease cost
Depreciation of leased assets	Cost of revenue, Research and development, Sales and marketing and General and administrative	$	321	$	318	$	643	$	637
Interest on lease liabilities	Interest expense		1,187		1,223		2,384		2,454
Total finance lease cost		$	1,508	$	1,541	$	3,027	$	3,091

Total lease cost		$	4,193	$	4,155	$	8,309	$	7,949

* Product / services, sales and marketing and general and administrative expense also includes short-term lease and variable lease costs of approximately $0.7 million and $1.3 million for the three and six months ended June 30, 2024, respectively, and includes short-term lease and variable lease costs of approximately $0.5 million and $1.0 million for the three and six months ended June 30, 2023, respectively.

The lease of our corporate headquarters, shown below under finance leases, had an original lease term of 22 years, beginning in January 2015 and expiring in January 2037, with renewal options. All other locations are treated as operating leases, with lease terms ranging from one to 16 years. The tables below reflect the minimum cash outflow regarding our current lease obligations as well as the weighted-average remaining lease term and weighted-average discount rates used in our calculation of our lease obligations and right-of-use assets as of June 30, 2024:


	Finance		Operating		Total
Maturity of Lease Liabilities	Leases		Leases		Leases

	(in thousands)
2024	$	3,132	$	3,740	$	6,872
2025		5,930		6,113		12,043
2026		6,008		4,448		10,456
2027		6,128		2,863		8,991
2028		6,251		1,959		8,210
Thereafter		55,336		23,205		78,541
Total lease payments	$	82,785	$	42,328	$	125,113
Less interest portion*		(38,329)		(13,362)		(51,691)
Finance lease and operating lease obligations	$	44,456	$	28,966	$	73,422

* Finance lease interest calculated using the implied interest rate; operating lease interest calculated using estimated corporate borrowing rate.

The table above does not include options to renew lease terms that are not reasonably certain of being exercised.

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	June 30,
Lease term and discount rate	2024
Weighted-average remaining lease term (years):
Operating leases		11.5
Finance leases		12.6
Weighted-average discount rate:
Operating leases		5.5%
Finance leases		10.5%

Our cash outflows from our operating leases include rent expense and other charges associated with these leases. These cash flows are included within the operating activities section of our statement of cash flows. Our cash flows from our finance lease include both an interest component and a principal component. The table below shows our cash outflows by lease type and related section of our statement of cash flows, as well as the non-cash amount capitalized on our balance sheet in relation to our operating lease right-of-use assets for the six months ended June 30, 2024 and 2023, respectively:



	Six months ended June 30,
Cash paid for amounts included in the measurement of lease liabilities	2024		2023

	(in thousands)
Operating cash outflows from operating leases	$	5,282	$	4,858
Operating cash outflows from finance leases		2,384		2,454
Financing cash outflows from finance leases		736		598
Operating lease assets obtained in exchange for operating lease liabilities		825		23,289
Finance lease assets obtained in exchange for new finance lease liabilities		—		—

Note 5. Revenue

To reflect the organization of our business operations, we divide revenue into two categories: revenue from sales of new systems and revenue arising from the sale of used systems, parts and labor to customers who own systems, which we refer to as “Aftermarket.”

Revenue by categories used by management are as follows:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
Systems	$	198,645	$	215,174	$	394,076	$	410,372
Aftermarket		57,867		58,796		114,807		117,618
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990

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We also consider revenue by geography. Revenue is allocated to geographic markets based upon the location to which our products are shipped and in which our services are performed. Revenue in our principal geographic markets is as follows:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
North America	$	34,373	$	37,918	$	79,876	$	83,084
Asia Pacific		196,159		205,941		384,376		397,044
Europe		25,980		30,111		44,631		47,862
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990

Our system sales revenue transactions give rise to contract liabilities (in the case of pre-payments and the fair value of goods and services to be delivered after the system delivery, such as installation and certain warranty obligations).

Contract liabilities are as follows:


	June 30,		December 31,
	2024		2023

	(in thousands)
Contract liabilities	$	174,011	$	210,885

Contract liabilities are reflected as deferred revenue on the consolidated balance sheets and include payments received in advance of system sales as well as deferral of revenue from systems sales for installation and other future performance obligations. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations.



	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
Balance, beginning of the period	$	208,418	$	201,725	$	210,885	$	154,777
Deferral of revenue*		19,625		34,977		55,227		107,556
Recognition of deferred revenue		(54,032)		(54,162)		(92,101)		(79,793)
Balance, end of the period	$	174,011	$	182,540	$	174,011	$	182,540

* Amount is net of a reclassification of $4.7 million from deferred revenue to refund liability for the three and six months ended June 30, 2024.

The majority of our system transactions have either (1) payment terms of 90% due upon shipment of the system and 10% due upon acceptance or (2) a pre-shipment deposit ranging from 20% to 60%, with the remainder due upon shipment, less 10% due at acceptance. Aftermarket transaction payment terms typically provide that payment is due either within 30 or 60 days after the service is provided or parts delivered.

Note 6. Receivables and Allowances for Credit Losses

All trade receivables are reported on the consolidated balance sheets at their amortized cost adjusted for any write-offs and net of allowances for credit losses.

We maintain an allowance for credit losses, which represents an estimate of expected losses over the remaining contractual life of our receivables, considering current market conditions and estimates for supportable forecasts when appropriate. The estimate is a result of our ongoing assessments and evaluations of collectability, historical loss experience, and future expectations in estimating credit losses in our receivable portfolio. We use historical loss experience rates and apply them to a related aging analysis while also considering customer and/or economic risk where appropriate. Determination of the proper amount of allowances requires management to exercise judgment about the timing, frequency and severity of credit losses that could materially affect the provision for credit losses and, as a result, net earnings. The

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allowance takes into consideration numerous quantitative and qualitative factors that include receivable type, historical loss experience, loss migration, delinquency trends, collection experience, current economic conditions, trade restrictions, estimates for supportable forecasts, when appropriate, and credit risk characteristics.

We evaluate the credit risk of the customer when extending credit based on a combination of financial and qualitative factors that may affect our customers’ ability to pay. These factors may include the customer’s financial condition, past payment experience, and credit bureau report, as well as the value of the underlying collateral.

Management performs detailed reviews of our receivables on a quarterly basis to assess the adequacy of the allowances and to determine if any impairment has occurred. Amounts determined to be uncollectable are charged directly against the allowances, while amounts recovered on previously written-off accounts increase the allowances. Changes to the allowances for credit losses are maintained through adjustments to the provision for credit losses, which are charged to current period earnings. We did not incur any credit losses or recoveries for the three month period ended June 30, 2024. We recorded $0.5 million of recovery of bad debt expense for the six-month period ended June 30, 2024. We did not have any allowance or incur any credit losses or recoveries for the six-month period ended June 30, 2023. As of both June 30, 2024 and 2023, we had no provision for credit losses.

Note 7. Computation of Net Earnings per Share

Basic earnings per share is computed by dividing income available to common stockholders (the numerator) by the weighted-average number of shares of common stock outstanding (the denominator) for the period. The computation of diluted earnings per share is similar to basic earnings per share, except that the denominator is increased by the number of additional shares of common stock that would have been outstanding if the potentially dilutive shares of common stock issuable on exercise of stock options and vesting of RSUs had been issued, calculated using the treasury stock method.

The components of net earnings per share are as follows:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands, except per share amounts)
Net income available to common stockholders	$	50,866	$	61,579	$	102,460	$	109,276
Weighted average shares of common stock outstanding used in computing basic income per share		32,598		32,775		32,618		32,759
Incremental options and RSUs		173		414		230		478
Weighted average shares of common stock used in computing diluted net income per share		32,771		33,189		32,848		33,237
Net income per share
Basic	$	1.56	$	1.88	$	3.14	$	3.34
Diluted	$	1.55	$	1.86	$	3.12	$	3.29

Diluted weighted average shares of common stock outstanding does not include 22,983 and 770 common equivalent shares issuable with respect to outstanding equity awards for the three-month periods ended June 30, 2024 and 2023, respectively, or 20,639 and 387 common equivalent shares issuable with respect to outstanding equity awards for the six-month periods ended June 30, 2024 and 2023, respectively, as their effect would have been anti-dilutive.

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Note 8. Accumulated Other Comprehensive Loss

The following table presents the changes in accumulated other comprehensive loss, net of tax, by component, for the six months ended June 30, 2024:


	Foreign		Defined benefit
	currency		pension plan		Total

	(in thousands)
Balance at December 31, 2023	$	(1,956)	$	110	$	(1,846)
Other comprehensive loss and pension reclassification		(2,644)		10		(2,634)
Balance at June 30, 2024	$	(4,600)	$	120	$	(4,480)

Note 9. Cash, cash equivalents and restricted cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the statement of cash flows:


	June 30,		December 31,
	2024			2023

	(in thousands)
Cash and cash equivalents	$	145,166	$	167,297
Long-term restricted cash		6,651		6,654
Total cash, cash equivalents and restricted cash	$	151,817	$	173,951

As of June 30, 2024, we had $6.7 million in restricted cash representing the total of (i) a $5.9 million cash collateral relating to our lease for our headquarters in Beverly, Massachusetts, (ii) a $0.7 million letter of credit relating to workers’ compensation insurance and (iii) a $0.1 million deposit relating to customs activity. See Note 13 for further discussion on the $5.9 million cash collateral.

Note 10. Inventories, net

The components of inventories are as follows:


	June 30,		December 31,
	2024		2023

	(in thousands)
Raw materials	$	220,910	$	231,200
Work in process		40,481		45,373
Finished goods (completed systems)		21,699		29,909
Inventories, net	$	283,090	$	306,482

When recorded, inventory reserves reduce the carrying value of inventories to their net realizable value. We establish inventory reserves when conditions exist that indicate inventory may be in excess of anticipated demand or is obsolete based upon assumptions about future demand for our products or market conditions. We regularly evaluate the ability to realize the value of inventories based on a combination of factors including the following: forecasted sales or usage, estimated product end of life dates, estimated current and future market value and new product introductions. Purchasing and usage alternatives are also explored to mitigate inventory exposure.

Note 11. Product Warranty

We generally offer a one-year warranty for all of our systems, the terms and conditions of which vary depending upon the product sold. For all systems sold, we accrue a liability for the estimated cost of standard warranty at the time of system shipment and, if applicable, defer the portion of systems revenue attributable to non-standard warranty. Costs for non-standard warranty are expensed as incurred. Factors that affect our warranty liability include the number of installed units, historical and anticipated product failure rates, material usage and service labor costs. We periodically assess the adequacy of our recorded liability and adjust the amount as necessary.

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The changes in our standard product warranty liability are as follows:


	Six months ended
	June 30,
	2024		2023

	(in thousands)
Balance at January 1 (beginning of year)	$	16,757	$	10,487
Warranties issued during the period		5,755		5,616
Settlements made during the period		(5,653)		(4,834)
Changes in estimate of liability for pre-existing warranties during the period		(444)		1,552
Balance at June 30 (end of period)	$	16,415	$	12,821

Amount classified as current	$	14,502	$	10,867
Amount classified as long-term (within other long-term liabilities)		1,913		1,954
Total warranty liability	$	16,415	$	12,821

Note 12. Fair Value Measurements

Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

(a) Fair Value Hierarchy

The accounting guidance for fair value measurement requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard establishes a fair value hierarchy based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

Level 1 - applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 2 - applies to assets or liabilities for which there are inputs other than quoted prices that are observable for the asset or liability, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets); or model-derived valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data.

Level 3 - applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

(b) Fair Value Measurements

Our money market funds and short-term investments with initial maturities of three months or less are included in cash and cash equivalents in the consolidated balance sheets. Other investments that have a maturity of greater than three months but less than one year are included within short-term investments in the consolidated balance sheets.

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The following table sets forth our assets by level within the fair value hierarchy:


	June 30, 2024
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	104,958	$	—	$	—	$	104,958
Short-term investments (U.S. Government Securities and Agency Investments)		402,820		—		—		402,820
Mark-to-market adjustment on forward exchange contracts		—		(323)		—		(323)
Total	$	507,778	$	(323)	$	—	$	507,455


	December 31, 2023
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	118,278	$	—	$	—	$	118,278
Short-term investments (U.S. Government Securities and Agency Investments)		339,240		—		—		339,240
Total	$	457,518	$	—	$	—	$	457,518

(c) Other Financial Instruments

The carrying amounts reflected in the consolidated balance sheets for accounts receivable, prepaid expenses, forward currency exchange contracts and other current assets and non-current assets, restricted cash, accounts payable and accrued expenses approximate fair value due to their short-term maturities.

(d) Forward Currency Exchange Contracts

Beginning in February 2024, we entered into forward currency exchange contracts to minimize the impact of foreign currency fluctuations on our earnings and cash flows. These contracts have month-to-month settlement dates. Any gains or losses on these contracts are reported within Other, net within our Consolidated Statement of Operations. Any open contracts at period end that have settlement dates within one month after the reported period end and any mark-to-market valuation adjustments related to these open contracts are recorded within the current asset or current liability account and any unrealized gain or loss recognized is recorded within Other, net within our Consolidated Statement of Operations. These contracts are measured at fair value using observable market inputs such as forward currency exchange rates and our counterparties’ credit risks. Based on these inputs, the derivative instruments are classified within Level 2 of the valuation hierarchy. At June 30, 2024, the recognized unrealized loss on these forward exchange contracts was approximately $323 thousand. Based on our continued ability to trade and enter into forward contracts, we consider the markets for our fair value instruments to be active. We evaluated the credit risk associated with the counterparties to these derivative instruments and determined that as of June 30, 2024, such credit risks have not had an adverse impact on the fair value of these instruments.

Note 13. Financing Arrangements

On January 30, 2015, we sold our corporate headquarters facility in Beverly, Massachusetts for $48.9 million. As part of the sale, we also entered into a 22-year lease agreement of our headquarters facility. This sale-leaseback is accounted for as a financing lease under generally accepted accounting principles and, as such, we have recorded a financing obligation of $44.5 million as of June 30, 2024. The associated lease payments include both an interest component and payment of principal, with the remaining liability being extinguished at the end of the original lease term.

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As of June 30, 2024, we had a security deposit of $5.9 million related to this lease in the form of a cash collateralized letter of credit issued with UBS Bank USA, which is classified as long-term restricted cash on our balance sheet at June 30, 2024.

Note 14. Income Taxes

Income tax expense was $6.4 million for the three months ended June 30, 2024, compared to $3.0 million for the three months ended June 30, 2023. The $3.4 million increase was primarily due to a decrease in stock compensation deduction. Income tax expense was $13.8 million for the six months ended June 30, 2024, compared to $8.2 million for the six months ended June 30, 2023. The increase was primarily due to a decrease in stock compensation deduction.

The effective tax rate for the three and six months ended June 30, 2024 was less than the U.S. statutory rate of 21% due to a forecasted Foreign Derived Intangible Income deduction, Federal research and development tax credits and a favorable discrete item related to equity compensation that reduces the annual tax rate.

The deferred income taxes of $55.4 million and $53.4 million as of June 30, 2024 and December 31, 2023, respectively, reflect the net tax effect of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, as well as the tax effect of carryforwards. As of June 30, 2024, we have recorded a $11.3 million valuation allowance in the U.S. against certain tax credits due to the uncertainty of their realization. Realization of our net deferred tax assets is dependent on future taxable income. We believe it is more likely than not that such assets will be realized; however, ultimate realization could be impacted by market conditions and other variables not known or anticipated at this time.

Note 15. Concentration of Risk

For the three months ended June 30, 2024, one customer accounted for 11.5% of total revenue. For the three months ended June 30, 2023, no individual customer accounted for greater than ten percent of total revenue.

For the six months ended June 30, 2024, no individual customer accounted for greater than ten percent of total revenue. For the six months ended June 30, 2023, two customers accounted for 11.6% and 11.1% of total revenue, respectively.

At June 30, 2024, one customer accounted for 11.3% of accounts receivable. At December 31, 2023, one customer accounted for 12.2% of accounts receivable.

Note 16. Share Repurchase

In February 2022, our Board of Directors approved stock repurchases of up to $100 million of our common stock. In August 2023, our Board of Directors approved additional funding of $200 million for our stock repurchase program, to be available on full utilization of the $100 million repurchase funding approved in February 2022. During the six months ended June 30, 2024, we repurchased 0.3 million shares at an average cost of $114.07 per share. The timing and actual number of any additional shares to be repurchased under this program will depend on various factors including price, corporate and regulatory requirements, alternative investment opportunities and other market conditions.

Repurchased shares are accounted for when the transaction is settled and returned to the status of authorized but unissued shares. Accordingly, on our balance sheet, the repurchase price is deducted from common stock par value and from additional paid-in capital for the excess over par value. If additional paid-in capital has been exhausted, the excess over par value is deducted from retained earnings. Direct costs incurred to acquire the shares are included in the total cost of the shares.

Note 17. Contingencies

(a) Litigation

We are from time to time a party to litigation that arises in the normal course of our business operations. We are not presently a party to any litigation that we believe might have a material adverse effect on our business operations.

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(b) Indemnifications

Our system sales agreements typically include provisions under which we agree to take certain actions, provide certain remedies and defend our customers against third-party claims of intellectual property infringement under specified conditions and indemnify customers against any damage and costs awarded in connection with such claims. We have not incurred any material costs as a result of such indemnifications and have not accrued any liabilities related to such obligations in the accompanying consolidated financial statements.

Note 18. Recent Accounting Guidance

In November 2023 the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). ASU 2023-07 is intended to enhance disclosures for significant segment expenses for all public entities required to report segment information in accordance with ASC Topic 280, Segment Reporting (“ASC 280”). ASC 280 requires a public entity to report for each reportable segment a measure of segment profit or loss that its chief operating decision maker (“CODM”) uses to assess segment performance and to make decisions about resource allocations. ASU 2023-07 is intended to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more useful financial analyses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. A public entity should apply ASU 2023-07 retrospectively to all prior periods presented in the consolidated financial statements. We are currently evaluating the impact of ASU 2023-07 on our future consolidated financial statements and related disclosures.

In December 2023 the FASB issued Accounting Standards Update 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). ASU 2023-09 is intended to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 addresses investor requests for enhanced income tax information primarily through changes to the rate reconciliation and income taxes paid information. Early adoption is permitted. A public entity should apply ASU 2023-09 prospectively to all annual periods beginning after December 15, 2024. We are currently evaluating the impact of ASU 2023-09 on our future consolidated financial statements and related disclosures.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Certain statements within "Management's Discussion and Analysis of Financial Condition and Results of Operations" are forward-looking statements that involve risks and uncertainties. Words such as may, will, should, would, anticipates, expects, intends, plans, believes, seeks, estimates and similar expressions identify such forward-looking statements. The forward-looking statements contained herein are based on current expectations and entail various risks and uncertainties that could cause actual results to differ materially from those expressed in such forward-looking statements. Factors that might cause such a difference include, among other things, those set forth under "Liquidity and Capital Resources" below and under “Risk Factors” in Part I, Item 1A to our 2023 Form 10-K, which discussion is incorporated herein by reference. Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management's analysis only as of the date hereof. We assume no obligation to update these forward-looking statements to reflect actual results or changes in factors or assumptions affecting forward-looking statements, except as may be required by law.

Overview

We are primarily a producer of ion implantation equipment used in the fabrication of semiconductor chips in the United States, Europe, and Asia. In addition, we provide extensive worldwide aftermarket service and support, including spare parts, equipment upgrades and maintenance services to the semiconductor industry. Our product development and manufacturing activities currently occur primarily in the United States and South Korea. Our equipment and service products are highly technical and are sold through a direct sales force in the United States, Europe, and Asia. Consolidation and partnering within the semiconductor manufacturing industry has resulted in a small number of customers representing a substantial portion of our business. Our ten largest customers accounted for 47.4% of total revenue for the six months ended June 30, 2024.

The first six months of 2024 exhibited continued strong demand for our capital equipment. The overall mature process segment represented 98% of our shipped systems revenue, with 1% of shipments to advanced logic and 1% of shipments to dynamic random-access memory (“DRAM”). Power device shipments comprised 59% of total systems revenue with the general mature segment representing 36%, and image sensors at 4%. Looking ahead, we expect demand from silicon carbide customers within the power segment to remain healthy in the second half, while in general mature, we may see some moderation in revenue in the second half, dependent on the macroeconomic environment and its impact on our customers’ spending patterns. In addition, we expect DRAM customers to start adding capacity as we exit 2024 and into 2025, while “NAND” spending is expected to begin picking up in 2025.

Critical Accounting Estimates

Management’s discussion and analysis of our financial condition and results of operations included herein and in our 2023 Form 10-K are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates and assumptions. Management’s estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Management has not identified any need to make any material change in, and has not changed, any of our critical accounting estimates and judgments as described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our 2023 Form 10-K.

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Results of Operations

The following table sets forth our results of operations as a percentage of total revenue:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023
Revenue:
Product	95.7	%	97.0	%	96.1	%	96.9	%
Services	4.3		3.0		3.9		3.1
Total revenue	100.0		100.0		100.0		100.0
Cost of revenue:
Product	52.5		53.6		51.6		54.8
Services	3.6		2.7		3.5		2.8
Total cost of revenue	56.1		56.3		55.1		57.6
Gross profit	43.9		43.7		44.9		42.4
Operating expenses:
Research and development	10.1		8.8		10.1		9.1
Sales and marketing	6.7		5.7		6.8		5.6
General and administrative	6.5		6.0		6.5		5.9
Total operating expenses	23.3		20.5		23.4		20.6
Income from operations	20.6		23.2		21.5		21.8
Other income (expense):
Interest income	2.4		1.6		2.3		1.6
Interest expense	(0.5)		(0.5)		(0.5)		(0.5)
Other, net	(0.1)		(0.7)		(0.4)		(0.6)
Total other income	1.8		0.4		1.4		0.5
Income before income taxes	22.4		23.6		22.9		22.3
Income tax provision	2.5		1.1		2.7		1.6
Net income	19.9	%	22.5	%	20.2	%	20.7	%

Revenue

The following table sets forth our product and services revenue:


	Three months ended						Period-to-Period				Six months ended						Period-to-Period
	June 30,						Change				June 30,						Change
	2024			2023			$		%		2024			2023			$		%

	(dollars in thousands)
Revenue:
Product	$	245,380		$	265,673		$	(20,293)	(7.6)	%	$	488,798		$	511,680		$	(22,882)	(4.5)	%
Percentage of revenue		95.7	%		97.0	%						96.1	%		96.9	%
Services		11,132			8,297			2,835	34.2	%		20,085			16,310			3,775	23.1	%
Percentage of revenue		4.3	%		3.0	%						3.9	%		3.1	%
Total revenue	$	256,512		$	273,970		$	(17,458)	(6.4)	%	$	508,883		$	527,990		$	(19,107)	(3.6)	%

Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

Product

Product revenue, which includes systems sales, sales of spare parts, product upgrades and used systems, was $245.4 million, or 95.7% of revenue, during the three months ended June 30, 2024, compared with $265.7 million, or 97.0% of revenue, for the three months ended June 30, 2023. The $20.3 million decrease in product revenue for the three-

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month period ended June 30, 2024, in comparison to the same period in 2023, was primarily driven by a decrease in system sales.

Deferred revenue includes payments received in advance of system sales as well as deferral of revenue from systems sales for installation and other future performance obligations. The total amount of deferred revenue at June 30, 2024 and December 31, 2023 was $174.0 million and $210.9 million, respectively.

Services

Services revenue, which includes the labor component of maintenance and service contracts and fees for service hours provided by on-site service personnel, was $11.1 million, or 4.3% of revenue, for the three months ended June 30, 2024, compared with $8.3 million, or 3.0% of revenue, for the three months ended June 30, 2023. Although services revenue typically increases with the expansion of the installed base of systems, it can fluctuate from period to period based on capacity utilization at customers’ manufacturing facilities, which affects the need for equipment service.

Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

Product

Product revenue was $488.8 million, or 96.1% of revenue, during the six months ended June 30, 2024, compared with $511.7 million, or 96.9% of revenue, for the six months ended June 30, 2023. The $22.9 million decrease in product revenue for the six-month period ended June 30, 2024, in comparison to the same period in 2023, was primarily driven by a decrease in system sales.

Services

Services revenue was $20.1 million, or 3.9% of revenue, for the six months ended June 30, 2024, compared with $16.3 million, or 3.1% of revenue, for the six months ended June 30, 2023.

Revenue Categories used by Management

In addition to the line item revenue categories discussed above, management also regularly disaggregates revenue in the following categories, which it finds relevant and useful:

●

Systems and Aftermarket revenues, in which “Aftermarket” is:

The portion of Product revenue relating to spare parts, product upgrades and used equipment, combined with

Services revenue, which is the labor component of Aftermarket revenues;

(Aftermarket purchases reflect current fab utilization as opposed to Systems purchases which reflect capital investment decisions by our customers, which have differing economic drivers);

●

Revenue by geographic regions, since economic factors impacting customer purchasing decisions may vary by geographic region; and

●

Revenue by our customer market segments, since they can be subject to different economic drivers at different periods of time, impacting a customer’s likelihood of purchasing capital equipment during any particular period. Currently, management references three customer market segments: memory, mature process technology and leading edge foundry and logic.

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Aftermarket and Systems Revenue

Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

Included in total revenue of $256.5 million during the three months ended June 30, 2024 is revenue from our Aftermarket business of $57.9 million, compared with $58.8 million of Aftermarket revenue for the three months ended June 30, 2023. Aftermarket revenue fluctuates from period to period based on capacity utilization at customers’ manufacturing facilities, which affects the sale of spare parts and demand for equipment service. Aftermarket revenue can also fluctuate from period to period based on the demand for system upgrades or used equipment. The remaining $198.6 million of revenue for the three months ended June 30, 2024 was systems revenue, compared with $215.2 million of systems revenue for the three months ended June 30, 2023. Systems revenue fluctuates from period to period based on our customers’ capital spending.

Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

Included in total revenue of $508.9 million during the six months ended June 30, 2024 is revenue from our Aftermarket business of $114.8 million, compared with $117.6 million of Aftermarket revenue for the six months ended June 30, 2023. The remaining $394.1 million of revenue for the six months ended June 30, 2024 was systems revenue, compared with $410.4 million of systems revenue for the six months ended June 30, 2023.

Gross Profit / Gross Margin

The following table sets forth our gross profit / gross margin:


	Three months ended						Period-to-Period				Six months ended						Period-to-Period
	June 30,						Change				June 30,						Change
	2024			2023			$		%			2024			2023		$		%

	(dollars in thousands)
Gross Profit:
Product	$	110,621		$	118,932		$	(8,311)	(7.0)	%	$	226,128		$	222,168		$	3,960	1.8	%
Product gross margin		45.1	%		44.8	%						46.3	%		43.4	%

Services		1,788			771			1,017	131.9	%		2,332			1,554			778	50.1	%
Services gross margin		16.1	%		9.3	%						11.6	%		9.5	%
Total gross profit	$	112,409		$	119,703		$	(7,294)	(6.1)	%	$	228,460		$	223,722		$	4,738	2.1	%
Gross margin		43.9	%		43.7	%						44.9	%		42.4	%

Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

Product

Gross margin from product revenue was 45.1% for the three months ended June 30, 2024, compared to 44.8% for the three months ended June 30, 2023. The increase in gross margin primarily resulted from a favorable mix of system revenue.

Services

Gross margin from services revenue was 16.1% for the three months ended June 30, 2024, compared to 9.3% for the three months ended June 30, 2023. The increase in gross margin is attributable to changes in the mix of service contracts.

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Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

Product

Gross margin from product revenue was 46.3% for the six months ended June 30, 2024, compared to 43.4% for the six months ended June 30, 2023. The increase in gross margin primarily resulted from a favorable mix of system revenue.

Services

Gross margin from services revenue was 11.6% for the six months ended June 30, 2024, compared to 9.5% for the six months ended June 30, 2023. The increase in gross margin is attributable to changes in the mix of service contracts.

Operating Expenses

The following table sets forth our operating expenses:


	Three months ended						Period-to-Period				Six months ended						Period-to-Period
	June 30,						Change				June 30,						Change
	2024			2023			$		%		2024			2023			$		%

	(dollars in thousands)
Research and development	$	25,786		$	24,130		$	1,656	6.9	%	$	51,448		$	47,903		$	3,545	7.4	%
Percentage of revenue		10.1	%		8.8	%						10.1	%		9.1	%
Sales and marketing		17,230			15,537			1,693	10.9	%		34,675			29,681			4,994	16.8	%
Percentage of revenue		6.7	%		5.7	%						6.8	%		5.6	%
General and administrative		16,583			16,328			255	1.6	%		32,988			31,073			1,915	6.2	%
Percentage of revenue		6.5	%		6.0	%						6.5	%		5.9	%
Total operating expenses	$	59,599		$	55,995		$	3,604	6.4	%	$	119,111		$	108,657		$	10,454	9.6	%
Percentage of revenue		23.3	%		20.5	%						23.4	%		20.6	%

Our operating expenses consist primarily of personnel costs, including wages, commissions, incentive-based compensation, stock-based compensation and related benefits and taxes; project material costs related to the design and development of new products and enhancement of existing products; and professional fees, travel and depreciation expenses.

Personnel costs are our largest expense, representing $35.3 million, or 59.2%, of our total operating expenses for the three months ended June 30, 2024, compared to $33.8 million, or 60.4%, of our total operating expenses for the three months ended June 30, 2023. Personnel costs were $71.7 million, or 60.2%, of our total operating expenses for the six months ended June 30, 2024, compared to $64.5 million, or 59.3%, of our total operating expenses for the six months ended June 30, 2023. The higher personnel costs for the three and six months ended June 30, 2024 are primarily due to increases in wages and headcount as well as stock compensation expense, partially offset by a decrease in bonus expense.

Research and Development


	Three months ended						Period-to-Period				Six months ended							Period-to-Period
	June 30,						Change				June 30,							Change
	2024			2023				$	%		2024			2023				$	%

	(dollars in thousands)
Research and development	$	25,786		$	24,130		$	1,656	6.9	%	$	51,448		$	47,903		$	3,545	7.4	%
Percentage of revenue		10.1	%		8.8	%						10.1	%		9.1	%

Our ability to remain competitive depends largely on continuously developing innovative technology, with new and enhanced features and systems and introducing them at competitive prices on a timely basis. Accordingly, based on our strategic plan, we establish annual research and development budgets to fund programs that we expect will solve customers’ high value, high impact, ion implantation challenges.

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Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

Research and development expense was $25.8 million during the three months ended June 30, 2024, an increase of $1.7 million, or 6.9%, compared with $24.1 million during the three months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with increases in wages and headcount.

Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

Research and development expense was $51.4 million during the six months ended June 30, 2024, an increase of $3.5 million, or 7.4%, compared with $47.9 million during the six months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with an increase in headcount.

Sales and Marketing


	Three months ended						Period-to-Period				Six months ended						Period-to-Period
	June 30,						Change				June 30,						Change
	2024			2023			$		%		2024			2023			$		%

	(dollars in thousands)
Sales and marketing	$	17,230		$	15,537		$	1,693	10.9	%	$	34,675		$	29,681		$	4,994	16.8	%
Percentage of revenue		6.7	%		5.7	%						6.8	%		5.6	%

Our sales and marketing expenses result primarily from the sale of our equipment and services through our direct sales force.

Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

Sales and marketing expense was $17.2 million during the three months ended June 30, 2024, an increase of $1.7 million, or 10.9%, compared with $15.5 million during the three months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with increases in wages and headcount.

Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

Sales and marketing expense was $34.7 million during the six months ended June 30, 2024, an increase of $5.0 million, or 16.8%, compared with $29.7 million during the six months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with increases in wages and headcount.

General and Administrative


	Three months ended						Period-to-Period				Six months ended						Period-to-Period
	June 30,						Change				June 30,						Change
	2024			2023			$		%		2024			2023			$		%

	(dollars in thousands)
General and administrative	$	16,583		$	16,328		$	255	1.6	%	$	32,988		$	31,073		$	1,915	6.2	%
Percentage of revenue		6.5	%		6.0	%						6.5	%		5.9	%

Our general and administrative expenses result primarily from the costs associated with our executive, finance, information technology, legal and human resource functions.

Three months ended June 30, 2024 Compared with Three months ended June 30, 2023

General and administrative expense was $16.6 million during the three months ended June 30, 2024, an increase of $0.3 million, or 1.6%, compared with $16.3 million during the three months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with an increase in headcount offset by a decrease in bonus expense.

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Six months ended June 30, 2024 Compared with Six months ended June 30, 2023

General and administrative expense was $33.0 million during the six months ended June 30, 2024, an increase of $1.9 million, or 6.2%, compared with $31.1 million during the six months ended June 30, 2023. The increase is primarily due to higher personnel expenses associated with an increase in headcount.

Other Income (Expense)


	Three months ended						Period-to-period				Six months ended						Period-to-period
	June 30,						change				June 30,						change
	2024			2023			$		%		2024			2023			$		%

	(dollars in thousands)
Other income (expense):	$	4,455		$	908		$	3,547	390.6	%	$	6,914		$	2,453		$	4,461	181.9	%
Percentage of revenue		1.8	%		0.4	%						1.4	%		0.5	%

Other income (expense) consists of interest earned and accretion on our invested cash balances, interest expense relating to the finance lease obligation we incurred in connection with the 2015 sale of our headquarters facility and other financing obligations as well as foreign exchange gains and losses attributable to both fluctuations of the U.S. dollar against local currencies of the countries in which we operate and forward currency exchange contracts.

Other income was $4.5 million for the three months ended June 30, 2024, compared with other income of $0.9 million for the three months ended June 30, 2023. The $3.5 million increase in other income (expense) compared to the same prior year period was primarily due to an increase in interest income of $1.7 million and foreign exchange gains of $2.3 million from forward currency exchange contracts partially offset by foreign exchange losses of $2.5 million. Other income was $6.9 million for the six months ended June 30, 2024, compared with other income of $2.5 million for the six months ended June 30, 2023. The $4.5 million increase in other income (expense) compared to the same prior year period was primarily due to an increase in interest income of $3.3 million and foreign exchange gains of $3.8 million from forward currency exchange contracts partially offset by foreign exchange losses of $5.9 million.

Income Tax Provision


	Three months ended							Period-to-period				Six months ended							Period-to-period
	June 30,							change				June 30,							change
	2024			2023				$		%		2024			2023				$		%

	(dollars in thousands)
Income tax provision	$	6,399			$	3,037		$	3,362	110.7	%	$	13,803			$	8,242		$	5,561	67.5	%
Percentage of revenue		2.5	%			1.1	%						2.7	%			1.6	%

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Liquidity and Capital Resources

At June 30, 2024, we had $145.2 million in unrestricted cash and cash equivalents and $403.1 million in short-term investments, in addition to $6.7 million in restricted cash. Management believes that maintaining a strong cash balance is necessary to fund a continuing ramp in our business which can require significant cash investment to meet sudden demand. Additionally, we are using cash to repurchase shares as part of our stock repurchase program and are considering both organic and inorganic opportunities to drive future growth, for which cash resources will be necessary.

Our liquidity is affected by many factors. Some of these relate specifically to the operations of our business, for example, the rate of sales of our products, and others relate to the uncertainties of global economic conditions, including the availability of credit and the condition of the overall semiconductor equipment industry. Our industry requires ongoing investments in operations and research and development that are not easily adjusted to reflect changes in revenue. As a result, profitability and cash flows can fluctuate more widely than revenue. Stock repurchases, as discussed below, also reduce our cash balances.

During the six months ended June 30, 2024 and 2023, we generated $82.3 million and $67.3 million, respectively, of cash related to operating activities.

Investing activities for the six months ended June 30, 2024 resulted in cash outflows of $61.3 million, $3.6 million of which was used for capital expenditures and $249.0 million of which was used to purchase short-term investments, offset by $191.3 million related to maturities of short-term investments. Investing activities for the six months ended June 30, 2023 resulted in cash outflows of $73.2 million, $5.2 million of which was used for capital expenditures and $188.9 million of which was used to purchase short-term investments, offset by $120.9 million related to maturities of short-term investments.

Financing activities for the six months ended June 30, 2024 resulted in a cash usage of $40.7 million. During the first six months of 2024, $30.0 million in cash was used to repurchase our common stock and $11.2 million was used for payments to government tax authorities for income tax withholding on employee compensation arising from the vesting of RSUs, where units are withheld by us to cover taxes, as well as $0.7 million relating to the reduction of the liability under the finance lease of our corporate headquarters. These amounts were partially offset by $1.2 million of proceeds related to the purchase of shares under our 2020 ESPP during the first six months of 2024. In comparison, financing activities for the six months ended June 30, 2023 resulted in cash usage of $40.1 million, $25.0 million of which related to the repurchase of our common stock and $15.5 million of which related to payments made to government tax authorities for income tax withholding on employee compensation arising from the vesting of RSUs, as well as $0.6 million relating to the reduction of our financing lease liability. These amounts were partially offset by $1.0 million of proceeds related to the purchase of shares under our 2020 ESPP and exercise of stock options during the first six months of 2023.

As of June 30, 2024, we had a security deposit of $5.9 million related to the lease of our corporate headquarters in the form of a cash collateralized letter of credit issued with UBS Bank USA, which is classified as long-term restricted cash on our balance sheet.

We believe that based on our current market, revenue, expense and cash flow forecasts, our existing cash and cash equivalents will be sufficient to satisfy our anticipated cash requirements for the short- and long-term.

Commitments and Contingencies

Significant commitments and contingencies at June 30, 2024 are consistent with those discussed in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and Note 16 to the consolidated financial statements included in our 2023 Form 10-K.

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

As of June 30, 2024, there have been no material changes to the quantitative information about market risk disclosed in Item 7A, “Quantitative and Qualitative Disclosures about Market Risk” included in our 2023 Form 10-K.

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Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report (the “Evaluation Date”). Based on this evaluation, our principal executive officer and principal financial officer concluded that, as of the Evaluation Date, these disclosure controls and procedures are effective.

Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) identified in connection with the evaluation of our internal control that occurred during the three months ended June 30, 2024 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

We are, from time to time, a party to litigation that arises in the normal course of our business operations. We are not presently a party to any litigation that we believe might have a material adverse effect on our business operations.

Item 1A. Risk Factors.

As of June 30, 2024, there have been no material changes to the risk factors described in Item 1A, “Risk Factors” included in our 2023 Form 10-K.

Item 2. Unregistered Sales of Equity Securities, Use of Proceeds, and Issuer Purchases of Equity Securities.

In February 2022, our Board of Directors authorized a share repurchase program for up to $100 million of the Company’s common stock. This program was announced on March 1, 2022. In August 2023, our Board of Directors approved additional funding of $200 million for our stock repurchase program, to be available upon the full utilization of the $100 million repurchase funding approved in February 2022. This additional funding was announced on September 12, 2023. The Company’s share repurchase program does not have an expiration date.

The following table summarizes the stock repurchase activity, based upon settlement date, for the three months ended June 30, 2024 as well as the approximate dollar value of shares that may yet be purchased pursuant to our stock repurchase program:


	Total Number of Shares Purchased	Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Program	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program

	(in thousands except per share amounts)
April 1 through April 30	78	$103.33	78		166,999
May 1 through May 31	63	$110.03	63		160,011
June 1 through June 30	—		—		160,011
Total	141		141

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not Applicable.

Item 5. Other Information.

During the quarter ended June 30, 2024, no director or officer adopted or terminated any contract, instrument or written plan for the purchase or sale of Axcelis securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any non-Rule 10b5-1 trading arrangement as defined in Item 408(c) of Regulation S-K.

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Item 6. Exhibits.

The following exhibits are filed herewith:


Exhibit No		Description

3.1		Restated Certificate of Incorporation of the Company filed November 2, 2017. Incorporated by reference to Exhibit 3.1 of the Company’s Form 10-Q filed with the Commission on November 3, 2017.

3.2		Certificate of Amendment to the Restated Certificate of Incorporation of the Company filed May 9, 2024. Incorporated by reference to Exhibit 3.1 of the Company’s Form 8-K filed with the Commission on May 9, 2024.

3.3		Bylaws of the Company, as amended as of May 11, 2022. Incorporated by reference to Exhibit 3.2 of the Company’s Form 8-K filed with the SEC on May 11, 2022.

31.1*		Certification of the Principal Executive Officer under Exchange Act Rule 13a-14(a)/15d-14(a) (Section 302 of the Sarbanes-Oxley Act), dated August 1, 2024.

31.2*		Certification of the Principal Financial Officer under Exchange Act Rule 13a-14(a)/15d-14(a) (Section 302 of the Sarbanes-Oxley Act), dated August 1, 2024.

32.1**		Certification of the Principal Executive Officer pursuant to Section 1350 of Chapter 63 of title 18 of the United States Code (Section 906 of the Sarbanes-Oxley Act), dated August 1, 2024.

32.2**		Certification of the Principal Financial Officer pursuant to Section 1350 of Chapter 63 of title 18 of the United States Code (Section 906 of the Sarbanes-Oxley Act), dated August 1, 2024.

101*		The following materials from the Company’s Form 10-Q for the quarter ended June 30, 2024, formatted in inline eXtensible Business Reporting Language (iXBRL): (i) Consolidated Statements of Operations, (ii) Consolidated Statements of Comprehensive Income, (iii) Consolidated Balance Sheets, (iv) Consolidated Statements of Cash Flows and (v) Notes to Consolidated Financial Statements (Unaudited). Filed herewith.

104*		Cover Page Interactive Data File (formatted as iXBRL and contained in Exhibit 101).

* Filed herewith
** This exhibit is being furnished rather than filed, and shall not be deemed incorporated by reference into any filing, in accordance with Item 601 of Regulation S-K.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.


	AXCELIS TECHNOLOGIES, INC.
DATED: August 1, 2024	By:	/s/ JAMES G. COOGAN

		James G. Coogan
		Executive Vice President and Chief Financial Officer
		Duly Authorized Officer and Principal Financial Officer

Exhibit 31.1

CERTIFICATION

of the Principal Executive Officer

Pursuant to Rule 13a-14(a)/15d-14(a) (implementing Section 302 of the Sarbanes-Oxley Act)

I, Russell J. Low, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Axcelis Technologies, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: August 1, 2024	/s/ RUSSELL J. LOW

	Russell J. Low,
	President and Chief Executive Officer

Exhibit 31.2

CERTIFICATION

of the Principal Financial Officer

Pursuant to Rule 13a-14(a)/15d-14(a) (implementing Section 302 of the Sarbanes-Oxley Act)

I, James G. Coogan, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Axcelis Technologies, Inc.;

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: August 1, 2024	/s/ JAMES G. COOGAN

	James G. Coogan,
	Executive Vice President and Chief Financial Officer

EXHIBIT 32.1

AXCELIS TECHNOLOGIES, INC.

Certification of the Principal Executive Officer

Pursuant to Section 1350 of Chapter 63 of title 18 of the United States Code

The undersigned Chief Executive Officer of Axcelis Technologies, Inc., a Delaware corporation, hereby certifies, for the purposes of Section 1350 of Chapter 63 of title 18 of the United States Code (as implemented by Section 906 of the Sarbanes-Oxley Act of 2002) as follows:

This Form 10-Q quarterly report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)) and the information contained herein fairly presents, in all material respects, the financial condition and results of operations of the Company.

IN WITNESS WHEREOF, the undersigned has executed this Certification as of August 1, 2024.


	/s/ RUSSELL J. LOW

	Russell J. Low
	President and Chief Executive Officer of Axcelis Technologies, Inc.

EXHIBIT 32.2

AXCELIS TECHNOLOGIES, INC.

Certification of the Principal Financial Officer

Pursuant to Section 1350 of Chapter 63 of title 18 of the United States Code

The undersigned Chief Financial Officer of Axcelis Technologies, Inc., a Delaware corporation, hereby certifies, for the purposes of Section 1350 of Chapter 63 of title 18 of the United States Code (as implemented by Section 906 of the Sarbanes-Oxley Act of 2002) as follows:

IN WITNESS WHEREOF, the undersigned has executed this Certification as of August 1, 2024.


	/s/ JAMES G. COOGAN

	James G. Coogan
	Executive Vice President and Chief Financial Officer of Axcelis Technologies, Inc.

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2024	Jul. 29, 2024
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2024
Securities Act File Number	000-30941
Entity Registrant Name	AXCELIS TECHNOLOGIES INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	34-1818596
Entity Address, Address Line One	108 Cherry Hill Drive
Entity Address, City or Town	Beverly
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01915
City Area Code	978
Local Phone Number	787-4000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	ACLS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,617,587
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001113232
Amendment Flag	false

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Total revenue	$ 256,512	$ 273,970	$ 508,883	$ 527,990
Cost of revenue:
Total cost of revenue	144,103	154,267	280,423	304,268
Gross profit	112,409	119,703	228,460	223,722
Operating expenses:
Research and development	25,786	24,130	51,448	47,903
Sales and marketing	17,230	15,537	34,675	29,681
General and administrative	16,583	16,328	32,988	31,073
Total operating expenses	59,599	55,995	119,111	108,657
Income from operations	52,810	63,708	109,349	115,065
Other income (expense):
Interest income	6,051	4,307	11,566	8,243
Interest expense	(1,339)	(1,349)	(2,684)	(2,702)
Other, net	(257)	(2,050)	(1,968)	(3,088)
Total other income	4,455	908	6,914	2,453
Income before income taxes	57,265	64,616	116,263	117,518
Income tax provision	6,399	3,037	13,803	8,242
Net income	$ 50,866	$ 61,579	$ 102,460	$ 109,276
Net income per share:
Basic	$ 1.56	$ 1.88	$ 3.14	$ 3.34
Diluted	$ 1.55	$ 1.86	$ 3.12	$ 3.29
Shares used in computing net income per share:
Basic weighted average shares of common stock	32,598	32,775	32,618	32,759
Diluted weighted average shares of common stock	32,771	33,189	32,848	33,237
Product
Revenue:
Total revenue	$ 245,380	$ 265,673	$ 488,798	$ 511,680
Cost of revenue:
Total cost of revenue	134,759	146,741	262,670	289,512
Services
Revenue:
Total revenue	11,132	8,297	20,085	16,310
Cost of revenue:
Total cost of revenue	$ 9,344	$ 7,526	$ 17,753	$ 14,756

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statements of Comprehensive Income
Net income	$ 50,866	$ 61,579	$ 102,460	$ 109,276
Other comprehensive loss:
Foreign currency translation adjustments	(913)	(1,011)	(2,644)	(961)
Amortization of actuarial net gain and other adjustments from pension plan, net of tax	5		10
Total other comprehensive loss	(908)	(1,011)	(2,634)	(961)
Comprehensive income	$ 49,958	$ 60,568	$ 99,826	$ 108,315

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 145,166	$ 167,297
Short-Term Investments	403,143	338,851
Accounts receivable, net	188,080	217,964
Inventories, net	283,090	306,482
Prepaid income taxes	4,107
Prepaid expenses and other current assets	54,741	49,397
Total current assets	1,078,327	1,079,991
Property, plant and equipment, net	52,417	53,971
Operating lease assets	28,918	30,716
Finance lease assets, net	15,989	16,632
Long-term restricted cash	6,651	6,654
Deferred income taxes	55,441	53,428
Other assets	50,662	40,575
Total assets	1,288,405	1,281,967
Current liabilities:
Accounts payable	45,782	54,400
Accrued compensation	16,069	31,445
Warranty	14,502	14,098
Income taxes		6,164
Deferred revenue	148,390	164,677
Current portion of finance lease obligation	1,452	1,511
Other current liabilities	17,984	12,834
Total current liabilities	244,179	285,129
Long-term finance lease obligation	43,004	43,674
Long-term deferred revenue	25,621	46,208
Other long-term liabilities	40,653	42,074
Total liabilities	353,457	417,085
Commitments and contingencies (Note 17)
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,617 shares issued and outstanding at June 30, 2024; 32,685 shares issued and outstanding at December 31, 2023	33	33
Additional paid-in capital	542,677	547,189
Retained earnings	396,718	319,506
Accumulated other comprehensive loss	(4,480)	(1,846)
Total stockholders' equity	934,948	864,882
Total liabilities and stockholders' equity	$ 1,288,405	$ 1,281,967

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2024	Dec. 31, 2023
Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	32,617	32,685
Common stock, shares outstanding	32,617	32,685

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)	Total
Balance at Dec. 31, 2022	$ 33	$ 550,299	$ 118,892	$ (1,968)	$ 667,256
Balance (in shares) at Dec. 31, 2022	32,775
Increase (Decrease) in Stockholders' Equity
Net income			47,697		47,697
Foreign currency translation adjustments				50	50
Exercise of stock options (in shares)	2
Exercise of stock options		25			25
Issuance of common stock on restricted stock units, net of shares withheld		(3,907)			(3,907)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	56
Stock-based compensation expense		3,199			3,199
Repurchase of common stock		(1,924)	(10,575)		(12,499)
Repurchase of common stock (in shares)	(107)
Balance at Mar. 31, 2023	$ 33	547,692	156,014	(1,918)	701,821
Balance (in shares) at Mar. 31, 2023	32,726
Balance at Dec. 31, 2022	$ 33	550,299	118,892	(1,968)	667,256
Balance (in shares) at Dec. 31, 2022	32,775
Increase (Decrease) in Stockholders' Equity
Net income					109,276
Foreign currency translation adjustments					(961)
Balance at Jun. 30, 2023	$ 33	540,120	206,813	(2,929)	744,037
Balance (in shares) at Jun. 30, 2023	32,836
Balance at Mar. 31, 2023	$ 33	547,692	156,014	(1,918)	701,821
Balance (in shares) at Mar. 31, 2023	32,726
Increase (Decrease) in Stockholders' Equity
Net income			61,579		61,579
Foreign currency translation adjustments				(1,011)	(1,011)
Issuance of stock under Employee Stock Purchase Plan		957			957
Issuance of stock under Employee Stock Purchase Plan (in shares)	6
Issuance of common stock on restricted stock units, net of shares withheld		(11,558)			(11,558)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	199
Stock-based compensation expense		4,749			4,749
Repurchase of common stock		(1,720)	(10,780)		(12,500)
Repurchase of common stock (in shares)	(95)
Balance at Jun. 30, 2023	$ 33	540,120	206,813	(2,929)	744,037
Balance (in shares) at Jun. 30, 2023	32,836
Balance at Dec. 31, 2023	$ 33	547,189	319,506	(1,846)	864,882
Balance (in shares) at Dec. 31, 2023	32,685
Increase (Decrease) in Stockholders' Equity
Net income			51,595		51,595
Foreign currency translation adjustments				(1,731)	(1,731)
Change in pension obligation, net of tax				5	5
Issuance of common stock on restricted stock units, net of shares withheld		(2,699)			(2,699)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	42
Stock-based compensation expense		4,690			4,690
Repurchase of common stock		(2,201)	(12,798)		(14,999)
Repurchase of common stock (in shares)	(122)
Balance at Mar. 31, 2024	$ 33	546,979	358,303	(3,572)	901,743
Balance (in shares) at Mar. 31, 2024	32,605
Balance at Dec. 31, 2023	$ 33	547,189	319,506	(1,846)	864,882
Balance (in shares) at Dec. 31, 2023	32,685
Increase (Decrease) in Stockholders' Equity
Net income					102,460
Foreign currency translation adjustments					(2,644)
Change in pension obligation, net of tax					10
Balance at Jun. 30, 2024	$ 33	542,677	396,718	(4,480)	934,948
Balance (in shares) at Jun. 30, 2024	32,617
Balance at Mar. 31, 2024	$ 33	546,979	358,303	(3,572)	901,743
Balance (in shares) at Mar. 31, 2024	32,605
Increase (Decrease) in Stockholders' Equity
Net income			50,866		50,866
Foreign currency translation adjustments				(913)	(913)
Change in pension obligation, net of tax				5	5
Issuance of stock under Employee Stock Purchase Plan		1,242			1,242
Issuance of stock under Employee Stock Purchase Plan (in shares)	10
Issuance of common stock on restricted stock units, net of shares withheld		(8,468)			(8,468)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	143
Stock-based compensation expense		5,469			5,469
Repurchase of common stock		(2,545)	(12,451)		(14,996)
Repurchase of common stock (in shares)	(141)
Balance at Jun. 30, 2024	$ 33	$ 542,677	$ 396,718	$ (4,480)	$ 934,948
Balance (in shares) at Jun. 30, 2024	32,617

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net income	$ 102,460	$ 109,276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,636	6,258
Deferred income taxes	(2,013)	(7,413)
Stock-based compensation expense	10,159	7,948
Provision for doubtful accounts	(459)
Provision for excess and obsolete inventory	2,846	2,494
Accretion of discounts and premiums on marketable securities	(6,623)	(5,753)
Currency loss on foreign denominated transactions	11,505	5,717
Changes in operating assets and liabilities:
Accounts receivable	25,009	8,173
Inventories	12,951	(63,294)
Prepaid expenses and other current assets	(5,849)	(5,095)
Accounts payable and other current liabilities	(18,541)	(18,266)
Deferred revenue	(35,957)	28,075
Income taxes	(8,391)	2,324
Other assets and liabilities	(12,443)	(3,170)
Net cash provided by operating activities	82,290	67,274
Cash flows from investing activities
Expenditures for property, plant and equipment and capitalized software	(3,624)	(5,202)
Purchase of short-term investments	(249,015)	(188,943)
Maturities of short-term investments	191,345	120,907
Net cash used in investing activities	(61,294)	(73,238)
Cash flows from financing activities
Net settlement on restricted stock grants	(11,167)	(15,465)
Repurchase of common stock	(29,995)	(24,999)
Proceeds from Employee Stock Purchase Plan purchases	1,242	957
Principal payments on finance lease obligation	(736)	(598)
Proceeds from exercise of stock options		25
Net cash used in financing activities	(40,656)	(40,080)
Effect of exchange rate changes on cash and cash equivalents	(2,474)	(1,147)
Net decrease in cash, cash equivalents and restricted cash	(22,134)	(47,191)
Cash, cash equivalents and restricted cash at beginning of period	173,951	186,347
Cash, cash equivalents and restricted cash at end of period	$ 151,817	$ 139,156

Nature of Business

6 Months Ended

Jun. 30, 2024

Nature of Business

Nature of Business

Note 1. Nature of Business

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2024

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Note 2. Significant Accounting Policies

Derivative instruments

We do not offset fair value amounts of derivative instruments. We do not use derivative instruments for speculative purposes.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2024

Stock-Based Compensation

Stock-Based Compensation

Note 3. Stock-Based Compensation

The 2012 Equity Plan is more fully described in Note 13 to the consolidated financial statements in our 2023 Form 10-K.

Leases

6 Months Ended

Jun. 30, 2024

Leases

Leases

Note 4. Leases


		June 30,		December 31,
Leases	Classification	2024		2023

Assets		(in thousands)
Operating leases	Operating lease assets	$	28,918	$	30,716
Finance lease	Finance lease assets*		15,989		16,632
Total leased assets		$	44,907	$	47,348
Liabilities
Current
Operating	Other current liabilities	$	4,637	$	4,978
Finance	Current portion of finance lease obligation		1,452		1,511
Non-current
Operating	Other long-term liabilities		24,329		25,724
Finance	Finance lease obligation		43,004		43,674
Total lease liabilities		$	73,422	$	75,887

*Finance lease assets are recorded net of accumulated depreciation of $46.9 million and include $0.6 million of prepaid financing costs as of June 30, 2024. Finance lease assets are recorded net of accumulated depreciation of $46.4 million and include $0.6 million of prepaid financing costs as of December 31, 2023.


		Three months ended				Six months ended
		June 30,				June 30,
Lease cost	Classification	2024		2023		2024		2023

Operating lease cost		(in thousands)
Product / services*	Cost of revenue	$	1,694	$	1,821	$	3,522	$	3,287
Research and development	Operating expenses		203		137		326		243
Sales and marketing*	Operating expenses		451		417		902		813
General and administrative*	Operating expenses		337		239		532		515
Total operating lease cost		$	2,685	$	2,614	$	5,282	$	4,858
Finance lease cost
Depreciation of leased assets	Cost of revenue, Research and development, Sales and marketing and General and administrative	$	321	$	318	$	643	$	637
Interest on lease liabilities	Interest expense		1,187		1,223		2,384		2,454
Total finance lease cost		$	1,508	$	1,541	$	3,027	$	3,091

Total lease cost		$	4,193	$	4,155	$	8,309	$	7,949

* Product / services, sales and marketing and general and administrative expense also includes short-term lease and variable lease costs of approximately $0.7 million and $1.3 million for the three and six months ended June 30, 2024, respectively, and includes short-term lease and variable lease costs of approximately $0.5 million and $1.0 million for the three and six months ended June 30, 2023, respectively.


	Finance		Operating		Total
Maturity of Lease Liabilities	Leases		Leases		Leases

	(in thousands)
2024	$	3,132	$	3,740	$	6,872
2025		5,930		6,113		12,043
2026		6,008		4,448		10,456
2027		6,128		2,863		8,991
2028		6,251		1,959		8,210
Thereafter		55,336		23,205		78,541
Total lease payments	$	82,785	$	42,328	$	125,113
Less interest portion*		(38,329)		(13,362)		(51,691)
Finance lease and operating lease obligations	$	44,456	$	28,966	$	73,422

* Finance lease interest calculated using the implied interest rate; operating lease interest calculated using estimated corporate borrowing rate.

The table above does not include options to renew lease terms that are not reasonably certain of being exercised.


	June 30,
Lease term and discount rate	2024
Weighted-average remaining lease term (years):
Operating leases		11.5
Finance leases		12.6
Weighted-average discount rate:
Operating leases		5.5%
Finance leases		10.5%



	Six months ended June 30,
Cash paid for amounts included in the measurement of lease liabilities	2024		2023

	(in thousands)
Operating cash outflows from operating leases	$	5,282	$	4,858
Operating cash outflows from finance leases		2,384		2,454
Financing cash outflows from finance leases		736		598
Operating lease assets obtained in exchange for operating lease liabilities		825		23,289
Finance lease assets obtained in exchange for new finance lease liabilities		—		—

Revenue

6 Months Ended

Jun. 30, 2024

Revenue

Revenue

Note 5. Revenue

Revenue by categories used by management are as follows:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
Systems	$	198,645	$	215,174	$	394,076	$	410,372
Aftermarket		57,867		58,796		114,807		117,618
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
North America	$	34,373	$	37,918	$	79,876	$	83,084
Asia Pacific		196,159		205,941		384,376		397,044
Europe		25,980		30,111		44,631		47,862
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990

Contract liabilities are as follows:


	June 30,		December 31,
	2024		2023

	(in thousands)
Contract liabilities	$	174,011	$	210,885



	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
Balance, beginning of the period	$	208,418	$	201,725	$	210,885	$	154,777
Deferral of revenue*		19,625		34,977		55,227		107,556
Recognition of deferred revenue		(54,032)		(54,162)		(92,101)		(79,793)
Balance, end of the period	$	174,011	$	182,540	$	174,011	$	182,540

* Amount is net of a reclassification of $4.7 million from deferred revenue to refund liability for the three and six months ended June 30, 2024.

Receivables and Allowances for Credit Losses

6 Months Ended

Jun. 30, 2024

Receivables and Allowances for Credit Losses

Receivables and Allowances for Credit Losses

Note 6. Receivables and Allowances for Credit Losses

All trade receivables are reported on the consolidated balance sheets at their amortized cost adjusted for any write-offs and net of allowances for credit losses.

Computation of Net Earnings per Share

6 Months Ended

Jun. 30, 2024

Computation of Net Earnings per Share

Computation of Net Earnings per Share

Note 7. Computation of Net Earnings per Share

The components of net earnings per share are as follows:


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands, except per share amounts)
Net income available to common stockholders	$	50,866	$	61,579	$	102,460	$	109,276
Weighted average shares of common stock outstanding used in computing basic income per share		32,598		32,775		32,618		32,759
Incremental options and RSUs		173		414		230		478
Weighted average shares of common stock used in computing diluted net income per share		32,771		33,189		32,848		33,237
Net income per share
Basic	$	1.56	$	1.88	$	3.14	$	3.34
Diluted	$	1.55	$	1.86	$	3.12	$	3.29

Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2024

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

Note 8. Accumulated Other Comprehensive Loss

The following table presents the changes in accumulated other comprehensive loss, net of tax, by component, for the six months ended June 30, 2024:


	Foreign		Defined benefit
	currency		pension plan		Total

	(in thousands)
Balance at December 31, 2023	$	(1,956)	$	110	$	(1,846)
Other comprehensive loss and pension reclassification		(2,644)		10		(2,634)
Balance at June 30, 2024	$	(4,600)	$	120	$	(4,480)

Cash, cash equivalents and restricted cash

6 Months Ended

Jun. 30, 2024

Cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash

Note 9. Cash, cash equivalents and restricted cash


	June 30,		December 31,
	2024			2023

	(in thousands)
Cash and cash equivalents	$	145,166	$	167,297
Long-term restricted cash		6,651		6,654
Total cash, cash equivalents and restricted cash	$	151,817	$	173,951

Inventories, net

6 Months Ended

Jun. 30, 2024

Inventories, net

Inventories, net

Note 10. Inventories, net

The components of inventories are as follows:


	June 30,		December 31,
	2024		2023

	(in thousands)
Raw materials	$	220,910	$	231,200
Work in process		40,481		45,373
Finished goods (completed systems)		21,699		29,909
Inventories, net	$	283,090	$	306,482

Product Warranty

6 Months Ended

Jun. 30, 2024

Product Warranty

Product Warranty

Note 11. Product Warranty

The changes in our standard product warranty liability are as follows:


	Six months ended
	June 30,
	2024		2023

	(in thousands)
Balance at January 1 (beginning of year)	$	16,757	$	10,487
Warranties issued during the period		5,755		5,616
Settlements made during the period		(5,653)		(4,834)
Changes in estimate of liability for pre-existing warranties during the period		(444)		1,552
Balance at June 30 (end of period)	$	16,415	$	12,821

Amount classified as current	$	14,502	$	10,867
Amount classified as long-term (within other long-term liabilities)		1,913		1,954
Total warranty liability	$	16,415	$	12,821

Fair Value Measurements

6 Months Ended

Jun. 30, 2024

Fair Value Measurements

Fair Value Measurements

Note 12. Fair Value Measurements

(a) Fair Value Hierarchy

Level 1 - applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 3 - applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

(b) Fair Value Measurements

The following table sets forth our assets by level within the fair value hierarchy:


	June 30, 2024
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	104,958	$	—	$	—	$	104,958
Short-term investments (U.S. Government Securities and Agency Investments)		402,820		—		—		402,820
Mark-to-market adjustment on forward exchange contracts		—		(323)		—		(323)
Total	$	507,778	$	(323)	$	—	$	507,455


	December 31, 2023
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	118,278	$	—	$	—	$	118,278
Short-term investments (U.S. Government Securities and Agency Investments)		339,240		—		—		339,240
Total	$	457,518	$	—	$	—	$	457,518

(c) Other Financial Instruments

(d) Forward Currency Exchange Contracts

Financing Arrangements

6 Months Ended

Jun. 30, 2024

Financing Arrangements

Financing Arrangements

Note 13. Financing Arrangements

Income Taxes

6 Months Ended

Jun. 30, 2024

Income Taxes

Income Taxes

Note 14. Income Taxes

Concentration of Risk

6 Months Ended

Jun. 30, 2024

Concentration of Risk

Concentration of Risk

Note 15. Concentration of Risk

At June 30, 2024, one customer accounted for 11.3% of accounts receivable. At December 31, 2023, one customer accounted for 12.2% of accounts receivable.

Share Repurchase

6 Months Ended

Jun. 30, 2024

Stockholders' Equity

Share Repurchase

Note 16. Share Repurchase

Contingencies

6 Months Ended

Jun. 30, 2024

Contingencies

Contingencies

Note 17. Contingencies

(a) Litigation

(b) Indemnifications

Recent Accounting Guidance

6 Months Ended

Jun. 30, 2024

Summary of Significant Accounting Policies

Recent Accounting Guidance

Note 18. Recent Accounting Guidance

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2024

Summary of Significant Accounting Policies

Derivative instruments

Derivative instruments

We do not offset fair value amounts of derivative instruments. We do not use derivative instruments for speculative purposes.

Leases (Tables)

6 Months Ended

Jun. 30, 2024

Leases

Schedule of operating and finance lease right-of-use assets and related lease obligations


		June 30,		December 31,
Leases	Classification	2024		2023

Assets		(in thousands)
Operating leases	Operating lease assets	$	28,918	$	30,716
Finance lease	Finance lease assets*		15,989		16,632
Total leased assets		$	44,907	$	47,348
Liabilities
Current
Operating	Other current liabilities	$	4,637	$	4,978
Finance	Current portion of finance lease obligation		1,452		1,511
Non-current
Operating	Other long-term liabilities		24,329		25,724
Finance	Finance lease obligation		43,004		43,674
Total lease liabilities		$	73,422	$	75,887

*Finance lease assets are recorded net of accumulated depreciation of $46.9 million and include $0.6 million of prepaid financing costs as of June 30, 2024. Finance lease assets are recorded net of accumulated depreciation of $46.4 million and include $0.6 million of prepaid financing costs as of December 31, 2023.

Schedule of lease costs


		Three months ended				Six months ended
		June 30,				June 30,
Lease cost	Classification	2024		2023		2024		2023

Operating lease cost		(in thousands)
Product / services*	Cost of revenue	$	1,694	$	1,821	$	3,522	$	3,287
Research and development	Operating expenses		203		137		326		243
Sales and marketing*	Operating expenses		451		417		902		813
General and administrative*	Operating expenses		337		239		532		515
Total operating lease cost		$	2,685	$	2,614	$	5,282	$	4,858
Finance lease cost
Depreciation of leased assets	Cost of revenue, Research and development, Sales and marketing and General and administrative	$	321	$	318	$	643	$	637
Interest on lease liabilities	Interest expense		1,187		1,223		2,384		2,454
Total finance lease cost		$	1,508	$	1,541	$	3,027	$	3,091

Total lease cost		$	4,193	$	4,155	$	8,309	$	7,949

* Product / services, sales and marketing and general and administrative expense also includes short-term lease and variable lease costs of approximately $0.7 million and $1.3 million for the three and six months ended June 30, 2024, respectively, and includes short-term lease and variable lease costs of approximately $0.5 million and $1.0 million for the three and six months ended June 30, 2023, respectively.

Schedule of future minimum operating and finance leases


	Finance		Operating		Total
Maturity of Lease Liabilities	Leases		Leases		Leases

	(in thousands)
2024	$	3,132	$	3,740	$	6,872
2025		5,930		6,113		12,043
2026		6,008		4,448		10,456
2027		6,128		2,863		8,991
2028		6,251		1,959		8,210
Thereafter		55,336		23,205		78,541
Total lease payments	$	82,785	$	42,328	$	125,113
Less interest portion*		(38,329)		(13,362)		(51,691)
Finance lease and operating lease obligations	$	44,456	$	28,966	$	73,422

* Finance lease interest calculated using the implied interest rate; operating lease interest calculated using estimated corporate borrowing rate.

Schedule of weighted-average remaining lease term and discount rates


	June 30,
Lease term and discount rate	2024
Weighted-average remaining lease term (years):
Operating leases		11.5
Finance leases		12.6
Weighted-average discount rate:
Operating leases		5.5%
Finance leases		10.5%

Schedule of cash outflows by lease type



	Six months ended June 30,
Cash paid for amounts included in the measurement of lease liabilities	2024		2023

	(in thousands)
Operating cash outflows from operating leases	$	5,282	$	4,858
Operating cash outflows from finance leases		2,384		2,454
Financing cash outflows from finance leases		736		598
Operating lease assets obtained in exchange for operating lease liabilities		825		23,289
Finance lease assets obtained in exchange for new finance lease liabilities		—		—

Revenue (Tables)

6 Months Ended

Jun. 30, 2024

Revenue

Schedule of revenue by discipline


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
Systems	$	198,645	$	215,174	$	394,076	$	410,372
Aftermarket		57,867		58,796		114,807		117,618
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990

Schedule of revenue by geographic markets


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands)
North America	$	34,373	$	37,918	$	79,876	$	83,084
Asia Pacific		196,159		205,941		384,376		397,044
Europe		25,980		30,111		44,631		47,862
Total Revenue	$	256,512	$	273,970	$	508,883	$	527,990

Schedule of Contract liabilities

Computation of Net Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2024

Computation of Net Earnings per Share

Schedule of components of net income per share


	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023

	(in thousands, except per share amounts)
Net income available to common stockholders	$	50,866	$	61,579	$	102,460	$	109,276
Weighted average shares of common stock outstanding used in computing basic income per share		32,598		32,775		32,618		32,759
Incremental options and RSUs		173		414		230		478
Weighted average shares of common stock used in computing diluted net income per share		32,771		33,189		32,848		33,237
Net income per share
Basic	$	1.56	$	1.88	$	3.14	$	3.34
Diluted	$	1.55	$	1.86	$	3.12	$	3.29

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2024

Accumulated Other Comprehensive Loss

Schedule of changes in accumulated other comprehensive loss, net of tax


	Foreign		Defined benefit
	currency		pension plan		Total

	(in thousands)
Balance at December 31, 2023	$	(1,956)	$	110	$	(1,846)
Other comprehensive loss and pension reclassification		(2,644)		10		(2,634)
Balance at June 30, 2024	$	(4,600)	$	120	$	(4,480)

Cash, cash equivalents and restricted cash (Tables)

6 Months Ended

Jun. 30, 2024

Cash, cash equivalents and restricted cash

Schedule of reconciliation of cash, cash equivalents and restricted cash


	June 30,		December 31,
	2024			2023

	(in thousands)
Cash and cash equivalents	$	145,166	$	167,297
Long-term restricted cash		6,651		6,654
Total cash, cash equivalents and restricted cash	$	151,817	$	173,951

Inventories, net (Tables)

6 Months Ended

Jun. 30, 2024

Inventories, net

Schedule of components of inventories


	June 30,		December 31,
	2024		2023

	(in thousands)
Raw materials	$	220,910	$	231,200
Work in process		40,481		45,373
Finished goods (completed systems)		21,699		29,909
Inventories, net	$	283,090	$	306,482

Product Warranty (Tables)

6 Months Ended

Jun. 30, 2024

Product Warranty

Schedule of product warranty liability


	Six months ended
	June 30,
	2024		2023

	(in thousands)
Balance at January 1 (beginning of year)	$	16,757	$	10,487
Warranties issued during the period		5,755		5,616
Settlements made during the period		(5,653)		(4,834)
Changes in estimate of liability for pre-existing warranties during the period		(444)		1,552
Balance at June 30 (end of period)	$	16,415	$	12,821

Amount classified as current	$	14,502	$	10,867
Amount classified as long-term (within other long-term liabilities)		1,913		1,954
Total warranty liability	$	16,415	$	12,821

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Measurements

Schedule of Company's assets and liabilities by level within the fair value hierarchy


	June 30, 2024
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	104,958	$	—	$	—	$	104,958
Short-term investments (U.S. Government Securities and Agency Investments)		402,820		—		—		402,820
Mark-to-market adjustment on forward exchange contracts		—		(323)		—		(323)
Total	$	507,778	$	(323)	$	—	$	507,455


	December 31, 2023
	Fair Value Measurements
	Level 1		Level 2		Level 3		Total

	(in thousands)
Assets
Cash equivalents and other short-term investments:
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	$	118,278	$	—	$	—	$	118,278
Short-term investments (U.S. Government Securities and Agency Investments)		339,240		—		—		339,240
Total	$	457,518	$	—	$	—	$	457,518

Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Foreign exchange gains (losses) realized	$ 2,300	$ 3,800
Forward exchange contracts
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Notional value of open forward contracts	$ 111,000	111,000
Unrealized gain on forward exchange contracts		$ (323)

Stock-Based Compensation (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock-Based Compensation
Stock-based compensation expense	$ 5,500	$ 4,700		$ 10,200	$ 7,900
Proceeds from Employee Stock Purchase Plan purchases				1,242	957
Common Stock
Stock-Based Compensation
Exercise of stock options (in shares)			2
Common Stock \| Employee Stock Purchase Plan
Stock-Based Compensation
Proceeds from Employee Stock Purchase Plan purchases	$ 1,200	$ 1,000		$ 1,200	$ 1,000
Common Stock \| Restricted Stock Units
Stock-Based Compensation
Exercise of stock options (in shares)	200	200		200	300

Leases (Details)	6 Months Ended
Leases (Details)	Jun. 30, 2024
Lease
Option to extend	true
Minimum
Lease
Renewal term	1 year
Maximum
Lease
Renewal term	3 years

Leases - Operating and Finance Lease Right-of-use-assets and Related Lease Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Leases
Operating lease assets	$ 28,918	$ 30,716
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating lease assets	Operating lease assets
Finance lease assets	$ 15,989	$ 16,632
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Finance lease assets	Finance lease assets
Total leased assets	$ 44,907	$ 47,348
Operating liabilities current	$ 4,637	$ 4,978
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current
Finance liabilities current	$ 1,452	$ 1,511
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Finance liabilities current	Finance liabilities current
Operating liabilities noncurrent	$ 24,329	$ 25,724
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Finance liabilities noncurrent	$ 43,004	$ 43,674
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Finance liabilities noncurrent	Finance liabilities noncurrent
Total lease liabilities	$ 73,422	$ 75,887
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current, Other Liabilities, Noncurrent	Other Liabilities, Current, Other Liabilities, Noncurrent
Finance lease, accumulated depreciation	$ 46,900	$ 46,400
Prepaid financing costs	$ 600	$ 600

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases - Lease Cost (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Lease cost
Total operating lease cost	$ 2,685	$ 2,614	$ 5,282	$ 4,858
Depreciation of leased assets	321	318	643	637
Interest on lease liabilities	1,187	1,223	2,384	2,454
Total finance lease cost	1,508	1,541	3,027	3,091
Total lease cost	4,193	4,155	8,309	7,949
Short-term lease and variable lease costs	700	500	1,300	1,000
Product / services*
Lease cost
Total operating lease cost	1,694	1,821	3,522	3,287
Research and development
Lease cost
Total operating lease cost	203	137	326	243
Sales and marketing*
Lease cost
Total operating lease cost	451	417	902	813
General and administrative*
Lease cost
Total operating lease cost	$ 337	$ 239	$ 532	$ 515

Leases - Future Minimum Cash Outflow and Weighted-average Remaining Lease Term and Discount Rate (Details) $ in Thousands	Jun. 30, 2024 USD ($) ft²	Dec. 31, 2023 USD ($)
Future minimum lease payments finance lease
2024	$ 3,132
2025	5,930
2026	6,008
2027	6,128
2028	6,251
Thereafter	55,336
Total lease payments	82,785
Less interest portion	(38,329)
Finance lease obligations	44,456
Future minimum lease payments operating lease
2024	3,740
2025	6,113
2026	4,448
2027	2,863
2028	1,959
Thereafter	23,205
Total lease payments	42,328
Less interest portion	(13,362)
Operating lease obligations	28,966
Future minimum lease payments finance and operating lease
2024	6,872
2025	12,043
2026	10,456
2027	8,991
2028	8,210
Thereafter	78,541
Total lease payments	125,113
Less interest portion	(51,691)
Total lease liabilities	73,422	$ 75,887
Lease term and discount rate
Right of use asset	28,918	30,716
Prepaid rent	600	600
Operating liabilities noncurrent	$ 24,329	$ 25,724
Finance lease term	22 years
Operating leases -Weighted-average remaining lease term (in years)	11 years 6 months
Finance leases - Weighted-average remaining lease term (in years)	12 years 7 months 6 days
Operating leases - Weighted-average discount rate	5.50%
Finance leases - Weighted-average discount rate	10.50%
Beverly Property Owner LLC
Lease term and discount rate
Area of Property \| ft²	101,800
Minimum
Lease term and discount rate
Operating lease term	1 year
Maximum
Lease term and discount rate
Operating lease term	16 years

Leases - Cash Flow by Lease Type (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Leases
Operating cash outflows from operating leases	$ 5,282	$ 4,858
Operating cash outflows from finance leases	2,384	2,454
Financing cash outflows from finance leases	736	598
Operating lease assets obtained in exchange for operating lease liabilities	$ 825	$ 23,289

Revenue - Revenue by discipline & geographical areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue
Total Revenue	$ 256,512	$ 273,970	$ 508,883	$ 527,990
North America
Disaggregation of Revenue
Total Revenue	34,373	37,918	79,876	83,084
Asia Pacific
Disaggregation of Revenue
Total Revenue	196,159	205,941	384,376	397,044
Europe
Disaggregation of Revenue
Total Revenue	25,980	30,111	44,631	47,862
Systems
Disaggregation of Revenue
Total Revenue	198,645	215,174	394,076	410,372
Aftermarket
Disaggregation of Revenue
Total Revenue	$ 57,867	$ 58,796	$ 114,807	$ 117,618

Revenue - Contract liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Revenue
Contract liabilities	$ 174,011	$ 208,418	$ 210,885	$ 182,540	$ 201,725	$ 154,777

Revenue - Deferred revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue
Balance, beginning of the period	$ 208,418	$ 201,725	$ 210,885	$ 154,777
Deferral of revenue	19,625	34,977	55,227	107,556
Recognition of deferred revenue	(54,032)	(54,162)	(92,101)	(79,793)
Balance, end of the period	174,011	$ 182,540	174,011	$ 182,540
Reclassification from deferred revenue to refund liability	$ 4,700		$ 4,700

Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue
Deferred revenue	$ 174,011	$ 208,418	$ 210,885	$ 182,540	$ 201,725	$ 154,777
Short-term deferred revenue	148,390		164,677
Long-term deferred revenue	$ 25,621		$ 46,208
Systems
Disaggregation of Revenue
Payment upon shipment of the system, as a percent	90.00%
Payment upon acceptance, as a percent	10.00%
Systems \| Minimum
Disaggregation of Revenue
Pre-shipment deposit, as a percent	20.00%
Systems \| Maximum
Disaggregation of Revenue
Pre-shipment deposit, as a percent	60.00%
Aftermarket \| Minimum
Disaggregation of Revenue
Payment upon delivery of parts, period	30 days
Aftermarket \| Maximum
Disaggregation of Revenue
Payment upon delivery of parts, period	60 days

Receivables and Allowances for Credit Losses - Trade Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023
Receivables and Allowances for Credit Losses
Recoveries	$ 0	$ 500	$ 0
Charge-offs	0		0
Provision for credit losses	$ 0	$ 0	$ 0

Computation of Net Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Computation of Net Earnings per Share
Net income available to common stockholders	$ 50,866	$ 51,595	$ 61,579	$ 47,697	$ 102,460	$ 109,276
Weighted average shares of common stock outstanding used in computing basic income per share	32,598		32,775		32,618	32,759
Incremental options and RSUs	173		414		230	478
Weighted average shares of common stock used in computing diluted net income per share	32,771		33,189		32,848	33,237
Net income per share
Basic	$ 1.56		$ 1.88		$ 3.14	$ 3.34
Diluted	$ 1.55		$ 1.86		$ 3.12	$ 3.29
Anti-dilutive common equivalent shares excluded from calculation	22,983		770		20,639	387

Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Changes in accumulated other comprehensive (loss) income, net of tax
Balance at beginning of period	$ (1,846)
Other comprehensive loss and pension reclassification	(2,634)
Balance at end of period	(4,480)
Foreign currency
Changes in accumulated other comprehensive (loss) income, net of tax
Balance at beginning of period	(1,956)
Other comprehensive loss and pension reclassification	(2,644)
Balance at end of period	(4,600)
Defined benefit pension plan
Changes in accumulated other comprehensive (loss) income, net of tax
Balance at beginning of period	110
Other comprehensive loss and pension reclassification	10
Balance at end of period	$ 120

Cash, cash equivalents and restricted cash (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 145,166	$ 167,297
Long-term Restricted Cash	6,651	6,654
Total cash, cash equivalents and restricted cash	151,817	$ 173,951	$ 139,156	$ 186,347
Security Deposit	5,900
Letter of credit related to workers' compensation insurance	700
Deposit related to customs activity	$ 100

Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Inventories, net
Raw materials	$ 220,910	$ 231,200
Work in process	40,481	45,373
Finished goods (completed systems)	21,699	29,909
Inventories, net	$ 283,090	$ 306,482

Product Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
Product Warranty (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Product Warranty
Product warranty period	1 year
Changes in standard product warranty liability
Balance at beginning of year	$ 16,757	$ 10,487
Warranties issued during the period	5,755	5,616
Settlements made during the period	(5,653)	(4,834)
Changes in estimate of liability for pre-existing warranties during the period	(444)	1,552
Balance at end of period	16,415	12,821
Product warranty classification
Amount classified as current	14,502	10,867	$ 14,098
Amount classified as long-term (within other long-term liabilities)	1,913	1,954
Total warranty liability	$ 16,415	$ 12,821	$ 16,757

Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value Measurements
Short-term investments (U.S. Government Securities and Agency Investments)	$ 403,143	$ 338,851
Forward exchange contracts
Fair Value Measurements
Mark-to-market adjustment on forward exchange contracts	(323)
Level 2 \| Forward exchange contracts \| Estimate of fair value measurement
Fair Value Measurements
Mark-to-market adjustment on forward exchange contracts	(323)
Recurring \| Estimate of fair value measurement
Fair Value Measurements
Total	507,455
Recurring \| Forward exchange contracts \| Estimate of fair value measurement
Fair Value Measurements
Mark-to-market adjustment on forward exchange contracts	(323)
Recurring \| Money market funds, U.S. Government Securities and Agency Investments \| Estimate of fair value measurement
Fair Value Measurements
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	104,958	118,278
Total		457,518
Recurring \| U.S. Government Securities and Agency Investments \| Estimate of fair value measurement
Fair Value Measurements
Short-term investments (U.S. Government Securities and Agency Investments)	402,820	339,240
Recurring \| Level 1
Fair Value Measurements
Total	507,778
Recurring \| Level 1 \| Money market funds, U.S. Government Securities and Agency Investments
Fair Value Measurements
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments)	104,958	118,278
Total		457,518
Recurring \| Level 1 \| U.S. Government Securities and Agency Investments
Fair Value Measurements
Short-term investments (U.S. Government Securities and Agency Investments)	402,820	$ 339,240
Recurring \| Level 2
Fair Value Measurements
Mark-to-market adjustment on forward exchange contracts	(323)
Recurring \| Level 2 \| Forward exchange contracts
Fair Value Measurements
Mark-to-market adjustment on forward exchange contracts	$ (323)

Financing Arrangements (Details) - USD ($) $ in Thousands	Jan. 30, 2015	Jun. 30, 2024	Dec. 31, 2023
Financing Arrangements
Long-term finance lease obligation		$ 43,004	$ 43,674
Security deposit		5,900
Building
Financing Arrangements
Proceeds from sale of corporate headquarters	$ 48,900
Lease term	22 years
Long-term finance lease obligation		44,500
UBS Bank USA
Financing Arrangements
Security deposit		$ 5,900

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Valuation allowance
Income tax expense	$ 6,399	$ 3,037	$ 13,803	$ 8,242
Increase (decrease) in income tax expense	3,400
Deferred tax assets, net	55,441		55,441		$ 53,428
Deferred tax assets valuation allowance	$ 11,300		$ 11,300
Maximum
Valuation allowance
Statutory income tax rate (as a percent)	21.00%		21.00%

Concentration of Risk (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
Concentration of Risk (Details) - customer	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenue \| Customer concentration risk
Concentration of Risk
Number of customers	1	0	0	2
Revenue \| Customer concentration risk \| First customer
Concentration of Risk
Percentage of concentration risk	11.50%			11.60%
Revenue \| Customer concentration risk \| Second customer
Concentration of Risk
Percentage of concentration risk				11.10%
Accounts Receivable \| Credit concentration risk
Concentration of Risk
Number of customers			1		1
Accounts Receivable \| Credit concentration risk \| First customer
Concentration of Risk
Percentage of concentration risk			11.30%		12.20%

Share Repurchase (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2024	Aug. 31, 2023	Feb. 28, 2022
Stockholders' Equity
Share repurchase program common stock authorized amount		$ 200.0	$ 100.0
Number of shares repurchased	0.3
Average cost	$ 114.07