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Stock-Based Awards | 3 Months Ended
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Mar. 31, 2025
Stock-Based Awards |
Stock-Based Awards | 11. Stock-Based Awards For the three months ended March 31, 2025, the Company had three stock-based compensation plans under which it was able to grant stock-based awards, the 2021 Stock Incentive Plan, as amended (the “2021 Plan”), the 2019 Inducement Stock Incentive Plan, as amended (the “2019 Inducement Plan”), and the 2014 Employee Stock Purchase Plan (the “ESPP”) (collectively, the “Stock Plans”). The 2021 Plan and the 2019 Inducement Plan provide for the grant of non-statutory stock options, restricted stock awards, restricted stock units (“RSUs”), performance stock units (“PSUs”), stock appreciation rights and other stock-based awards. The 2021 Plan also provides for the grant of incentive stock options. The terms and conditions of the Stock Plans are described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the SEC on March 3, 2025. As of March 31, 2025, 2,346,204, 635,606, and 393,055 shares of common stock remained available for issuance under the 2021 Plan, the 2019 Inducement Plan, and the ESPP, respectively. Stock options, RSUs and PSUs During the three months ended March 31, 2025, the Company granted options to purchase 3,223,226 shares of common stock at a weighted exercise price of $7.40 per share. Of these, options to purchase 3,057,334 shares of common stock were granted under the 2021 Plan, and options to purchase 165,892 shares of common stock were granted under the 2019 Inducement Plan. During the three months ended March 31, 2025, the Company granted 2,313,896 RSUs. Of these, 2,267,021 RSUs were granted under the 2021 Plan, and 46,875 RSUs were granted under the 2019 Inducement Plan. Each RSU is settleable for one share of common stock upon vesting. On February 11, 2025, the Company granted 1,500,000 PSUs to its Executive Chairman, President and Chief Executive Officer under the 2021 Plan. Each PSU is settleable for one share of common stock upon vesting. The PSUs are allocated equally across four tranches, which can be earned during a five-year performance period commencing on the grant date (the “Performance Period”), if the Company’s consecutive 60-day closing stock price average meets or exceeds per share price hurdles of $15.00, $20.00, $25.00 and $30.00, as applicable. All PSUs are subject to a service condition. The PSUs earned during the first three years of the Performance Period are subject to additional service-based vesting requirements through the third anniversary of the grant date. The fair value of each tranche of the PSUs was estimated using a Monte Carlo simulation. The main inputs to valuing each tranche include the risk-free interest rate, expected volatility, the contractual term of five years, and no expected dividend yield. The requisite service period for each tranche was derived from the Monte Carlo simulation, taking into account the three-year minimum service requirement. On February 11, 2025, the Company’s board of directors also approved a grant of 2,750,000 performance stock options (the “Performance Option Award”) to the Company’s Executive Chairman, President and Chief Executive Officer under the 2021 Plan which can be earned based on the same conditions as those described above for the PSUs. The Performance Option Award is contingent upon stockholder approval of an increase in the number of shares of common stock authorized under the 2021 Plan and is, in accordance with the guidance of Accounting Standards Codification Topic 718 Compensation—Stock Compensation, not deemed granted for financial accounting purposes until such approval is obtained. During the three months ended March 31, 2025, 1,048,631 stock options and 102,777 RSUs expired or were forfeited. Stock-based Compensation The Company recorded stock-based compensation expense related to stock options, RSUs and PSUs in the following expense categories of its unaudited condensed consolidated statements of operations and comprehensive loss: ​
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​ | ​ | Three Months Ended |
​ | ​ | March 31, | ​
​ |  | 2025 |  | 2024 |
Research and development | ​ | $ | 3,018 | ​ | $ | 1,453 | ​
Selling and marketing | ​ |  | 1,177 | ​ |  | 837 | ​
General and administrative | ​ |  | 6,261 | ​ |  | 5,688 | ​
​ | ​ | $ | 10,456 | ​ | $ | 7,978 | ​
​ During the three months ended March 31, 2025, the Company modified the terms of certain stock options and RSUs that were previously granted to former executives of the Company, resulting in incremental stock-based compensation expense of $1,542. As of March 31, 2025, the Company had an aggregate of $82,580 of unrecognized stock-based compensation cost, which is expected to be recognized over a weighted average period of 2.88 years.

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