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Stock award plan - (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Share-based Payment Arrangement [Abstract] |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted- |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | average | ​ | ​ | Aggregate
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | ​ | intrinsic
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | ​ | value(in
​ | ​ | options | ​ | price | ​ | term | ​ | ​ | thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
Outstanding at December 31, 2023 |  | 9,600,399 | ​ | $ | 43.59 |  |  |  | ​ | ​ |
Granted |  | 855,385 | ​ | $ | 25.69 |  |  |  | ​ | ​ |
Exercised |  | (109,892) | ​ | $ | 19.22 |  |  |  | ​ | ​ |
Forfeited/Cancelled |  | (815,707) | ​ | $ | 45.32 |  |  |  | ​ | ​ |
Outstanding at March 31, 2024 |  | 9,530,185 | ​ | $ | 42.12 |  | 5.90 | years | ​ | $ | 12,025
Vested or Expected to vest at March 31, 2024 |  | 2,112,348 | ​ | $ | 38.57 |  | 8.67 | years | ​ | $ | 2,949
Exercisable at March 31, 2024 |  | 7,173,552 | ​ | $ | 43.44 |  | 4.98 | years | ​ | $ | 8,598
​ ​ ​ ​ ​
Schedule of assumptions used to estimate fair values of grants made on the date of grant | ​
​ | ​ | ​ | ​
​ |  | Three months ended |
​ |  | March 31, 2024 |
Risk-free interest rate |  | 4.23% |
Expected volatility |  | 53% |
Expected term |  | 5.5 years |
Summary of information on the Company's restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restricted Stock Awards and Units
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant
​ | ​ | Number of | ​ | Date
​ |  | Shares |  | Fair Value
Unvested at December 31, 2023 | ​ | 2,866,270 | ​ | $ | 41.82
Granted |  | 1,785,660 | ​ | ​ | 25.69
Vested |  | (835,179) | ​ | ​ | 44.56
Forfeited |  | (86,585) | ​ | ​ | 40.98
Unvested at March 31, 2024 |  | 3,730,166 | ​ | $ | 33.51
Schedule of share-based compensation expense recorded in the statement of operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2024 |  | 2023 |
Research and development | ​ | $ | 8,967 | ​ | $ | 15,314 | ​
Selling, general and administrative | ​ |  | 9,411 | ​ |  | 13,501 | ​
Total | ​ | $ | 18,378 | ​ | $ | 28,815 | ​
​

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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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