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Warrants | 12 Months Ended
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Dec. 31, 2023
Warrants Disclosure [Abstract] |
Warrants | 10. Warrants In connection with the Company’s November 2018 private placement that provided net proceeds of approximately $47.1 million, the Company issued warrants to purchase an aggregate of 1,262,626 shares of common stock, which became exercisable six months after the closing of the private placement, or the November 2018 Warrants. The November 2018 Warrants had an exercise price of $45.15 per share and have a five-year term. The fair value of the November 2018 Warrants was estimated at $18.4 million using a Black-Scholes model with the following assumptions: expected volatility of 71%, risk free interest rate of 2.99%, expected life of five years and no dividends. On July 26, 2019 and September 12, 2019, the Company entered into agreements with existing investors whereby the investors exercised the November 2018 Warrants for an aggregate of 1,186,869 shares of common stock, at an exercise price of $45.15 per share. Proceeds from the warrant exercise after deducting placement agent fees and other related expenses of $1.1 million were approximately $52.5 million. The Company issued participating investors new warrants to purchase up to 1,186,869 additional shares of common stock (the "2019 Warrants") as consideration for the warrant holders to exercise their November 2018 Warrants. The 2019 Warrants will expire on the fifth anniversary of the initial exercise date and have an exercise price of $105.00. The 2019 Warrants were valued using a Black-Scholes valuation model and resulted in a $60.8 million non-cash charge in the Company’s statement of operations in 2019. On October 22, 2019, the Company entered into the 2019 R&D Agreement with MD Anderson. In connection with the execution of the 2019 R&D Agreement, the Company issued the MD Anderson Warrant to purchase 222,222 shares of common stock. The MD Anderson Warrant has an initial exercise price of $0.015 per share and grant date fair value of $14.5 million. The MD Anderson Warrant expires on December 31, 2026 and vests upon the occurrence of certain clinical milestones. The Company will recognize expense on the MD Anderson Warrant in the same manner as if the Company paid cash for services to be rendered. For the years ended December 31, 2023 and 2022, the Company did not recognize any expense related to the MD Anderson Warrant as the clinical milestones have not been achieved. On August 6, 2021, the Company entered into the Loan and Security Agreement with SVB. Refer to Note 4, Debt. In connection with the Loan and Security Agreement, the Company issued SVB warrants to purchase 28,856 shares of common stock with an exercise price of $33.30 per share. The warrants have a ten-year life and were fully vested upon issuance. The fair value of the warrants was estimated at $0.8 million using a Black-Scholes model with the following assumptions: expected volatility of 79%, risk free interest rate of 1.31%, expected life of ten years and no dividends. On December 28, 2021, the Company entered into the First Amendment, as described in Note 4, Debt, in connection with which, the original warrants issued to SVB were amended and restated. As amended and restated, the SVB Warrants are for up to 43,308 shares of common stock, in the aggregate, with an exercise price of $17.40 per share. The SVB Warrants expire on August 6, 2031 and were fully vested upon issuance. As of December 31, 2023, none of the SVB Warrants have been exercised.

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