Financing Activities. Net cash provided by financing activities during the three months ended March 31, 2021 was $5.8 million, an increase of $3.4 million compared to the same period in 2020. The increase was due to incremental cash proceeds from the exercise of our common stock.
At the Market Sales Agreement. On March 1, 2021, we entered into a sales agreement to sell shares of our common stock, from time to time and having an aggregate offering price of up to $150.0 million, through an “at the market” equity offering program. As of March 31, 2021, we have not sold any shares under this agreement.
Line of Credit Agreement. Our Line of Credit Agreement with Silicon Valley Bank provides for a $50.0 million revolving line of credit facility. Under the Line of Credit Agreement we may draw, on a revolving basis, up to the lesser of $50.0 million or 85.0% of our eligible accounts receivable, less certain reserves. The Line of Credit Agreement is secured by all of our assets, excluding intellectual property and development program inventories, and matures on August 2, 2022. As of March 31, 2021, we had no outstanding borrowings under the Line of Credit Agreement, and we were in compliance with all covenants in all material respects. See earlier discussion under “Liquidity and Capital Resources” for further detail regarding the availability of the line of credit.
Contractual Obligations and Commitments
Our future minimum contractual commitments and obligations were reported in our Annual Report on Form 10-K for the year ended December 31, 2020. Other than the following, our future minimum contractual obligations and commitments have not changed materially from the amounts previously reported.
Lease Agreements
Our lease for our office and laboratory space ends in November 2027. We have two five-year options to extend the lease term. As of March 31, 2021, the remaining aggregate non-cancelable rent payable under the initial term of the lease, excluding common area maintenance and related operating expenses, is $53.8 million.
Goods and Services
We have certain other non-cancelable obligations under various agreements that relate to goods and services. As of March 31, 2021, our aggregate firm commitments were $30.9 million.
We may be required, in connection with in-licensing or asset acquisition agreements, to make certain royalty and milestone payments and we cannot, at this time, determine when or if the related milestones will be achieved or whether the events triggering the commencement of payment obligations will occur. Therefore, such payments are not included in the amounts described above.
Critical Accounting Policies and Significant Judgments and Estimates
On January 1, 2021, we adopted ASU 2020-06, Debt—Debt with Conversion Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) on a modified retrospective basis (for more information, see “Note 2—Significant Accounting Policies, Recently Adopted Pronouncements”).
Other than the adoption of ASU 2020-06, there have not been any material changes in our critical accounting policies and significant judgments and estimates as disclosed in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual Report on Form 10-K for the year ended December 31, 2020.
Off-Balance Sheet Arrangements
We have not engaged in any off-balance sheet arrangements.