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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Stockholders' Equity | (8) Stockholders’ Equity Rights Plan On February 20, 2024, the Board of Directors of the Company declared a dividend of one preferred share purchase right (a “Right”), payable on March 1, 2024, for each share of common stock of the Company outstanding on March 1, 2024 to the stockholders of record on that date and for certain warrants to purchase Common Stock outstanding on March 1, 2024. In connection with the distribution of the Rights, the Company entered into a Rights Agreement, dated as of February 20, 2024, between the Company and Equiniti Trust Company LLC, as rights agent (the “Rights Agreement”). Each Right entitled the registered holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.001 per share, of the Company (the “Series A Preferred Stock”) at a price of $12.00 per one one-thousandth of a share of Series A Preferred Stock represented by a Right (the “Purchase Price”), subject to adjustment. The Rights were determined to have no value upon issuance and expired on February 20, 2025. October 2023 Financing On October 3, 2023, the Company issued and sold in an underwritten public offering: • 3,921,928 shares of its common stock at a price of $2.84 per share, less underwriting discounts and commissions; • pre-funded warrants to purchase up to 3,472,435 shares of its common stock at a price of $2.839 exercisable immediately following the consummation of the offering; and • accompanying common stock warrants (the “purchase warrants”) to purchase up to 7,394,363 shares of its common stock at a price of $3.408 per share that are exercisable immediately after issuance and expire five years from the date of issuance. Each share of its common stock and each pre-funded warrant was sold together with a common warrant to purchase one share of its common stock. A holder of pre-funded warrants may not exercise the warrant if the holder, together with its affiliates, would beneficially own more than 4.99% (or, upon election by a holder prior to the issuance of any warrants, 9.99%) of the number of shares of common stock outstanding immediately after giving effect to such exercise. The net proceeds to the Company from the sale of common stock and pre-funded warrants through the offering, after deducting the underwriting discounts and commissions and offering expenses payable by the Company, were approximately $19.6 million. The common stock and pre-funded warrants met the criteria for equity classification. The purchase warrants met the definition of a derivative instrument. Accordingly, upon issuance, the purchase warrants were recorded as a liability at fair value using the Black-Scholes option-pricing model in the amount of $13.4 million. Any subsequent change in fair value of the purchase warrants is recognized in the consolidated statements of operations and comprehensive income (loss). The residual proceeds were allocated between the common stock and pre-funded warrants based on their relative fair values at the time of issuance. The amount allocated to the pre-funded warrants was recorded as a component of stockholders’ equity within additional paid-in capital. At September 30, 2025, the fair value of the purchase warrants was $5.3 million. Accordingly, a loss on remeasurement of the purchase warrant liability of $1.5 million and $0.4 million was recorded in the three and nine months ended September 30, 2025, respectively. Subsequent to their issuance and as of September 30, 2025, 2,920,126 pre-funded warrants have been exercised. None of the purchase warrants have been exercised since their issuance. Ginkgo Warrants In June 2019, the Company issued to Ginkgo an aggregate of 422,718 shares of common stock at a purchase price per share of $135, and pre-funded warrants (the Ginkgo pre-funded warrants) to purchase up to an aggregate of 169,874 shares of common stock at an exercise price of $135 per share, with $134.85 of such exercise price paid at the closing of the offering. The net proceeds to the Company were approximately $79.9 million. None of the Ginkgo pre-funded warrants have been exercised as of September 30, 2025. (See Note 11, Collaboration Agreements, in the audited financial statements included in the 2024 Annual Report). The Company has reserved for future issuance the following shares of common stock related to the potential exercise of Ginkgo pre-funded warrants, exercise of stock options, and the employee stock purchase plan:
| September 30, 2025 |
Common stock issuable under pre-funded warrants |  | 552,309 |
Common stock issuable under purchase warrants |  | 7,394,363 |
Common stock issuable under Ginkgo pre-funded warrants |  | 169,874 |
Options exercisable to purchase common stock |  | 195,053 |
Employee Stock Purchase Plan |  | — |
Total |  | 8,311,599 |

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