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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Stock-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | Remaining
​ | ​ | ​ | ​ | Price | ​ | Contractual
​ |  | Shares |  | Per Share |  | Term (In Years)
Options outstanding at December 31, 2023 |  | 6,378,924 | ​ | $ | 29.69 | ​ | 7.5
Granted |  | 5,000 | ​ | $ | 37.08 | ​ | ​
Exercised |  | (222,619) | ​ | $ | 16.27 | ​ | ​
Canceled |  | (2,568) | ​ | $ | 83.21 | ​ | ​
Options outstanding at March 31, 2024 |  | 6,158,737 | ​ | $ | 30.16 | ​ | 7.4
Options vested and expected to vest at March 31, 2024 |  | 6,065,176 | ​ | $ | 30.14 | ​ | 7.3
Options exercisable at March 31, 2024 |  | 3,284,980 | ​ | $ | 29.45 | ​ | 6.3
Shares available for grant under the 2021 Plan |  | 1,011,071 | ​ | ​ | ​ | ​ | ​
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2024 |  | 2023
​ | ​ | (In thousands)
Research and development | ​ | $ | 3,693 | ​ | $ | 2,162
General and administrative | ​ |  | 3,509 | ​ |  | 2,178
Total stock-based compensation expense | ​ | $ | 7,202 | ​ | $ | 4,340
​
Schedule of assumptions used for the fair value of employee stock options granted | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
|  | 2024 |  | 2023
Expected stock price volatility |  | 92% | ​ | 92%
Expected option term |  | 6.0 Years | ​ | 6.0 Years
Risk-free interest rate |  | 4.0 – 4.3% | ​ | 3.7 – 4.0%
Expected dividend yield |  | None | ​ | None
​

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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