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Stock award plan - (Tables) | 6 Months Ended
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Jun. 30, 2025
Stock award plan |
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, 2024 |  | 8,482,489 | ​ | $ | 42.29 |  |  |  | ​ | ​ |
Granted |  | 822,470 | ​ | $ | 46.84 |  |  |  | ​ | ​ |
Exercised |  | (467,285) | ​ | $ | 36.68 |  |  |  | ​ | ​ |
Forfeited/Cancelled |  | (531,684) | ​ | $ | 54.13 |  |  |  | ​ | ​ |
Outstanding at June 30, 2025 |  | 8,305,990 | ​ | $ | 42.30 |  | 5.80 | years | ​ | $ | 78,400
Expected to vest at June 30, 2025 |  | 1,658,277 | ​ | $ | 38.81 |  | 8.67 | years | ​ | $ | 16,967
Exercisable at June 30, 2025 |  | 6,462,776 | ​ | $ | 43.28 |  | 4.97 | years | ​ | $ | 59,655
​
Schedule of assumptions used to estimate fair values of grants made on the date of grant | ​
​ | ​ | ​ | ​
​ |  | Six months ended |
​ |  | June 30, 2025 |
Risk-free interest rate |  | 3.93% - 4.44% |
Expected volatility |  | 55% - 56% |
Expected term |  | 5.5 years |
Summary of information on the Company's restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restricted Stock Units
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant
​ | ​ | Number of | ​ | Date
​ |  | Shares |  | Fair Value
Unvested at December 31, 2024 | ​ | 3,527,575 | ​ | $ | 33.39
Granted |  | 1,576,245 | ​ | ​ | 46.87
Vested |  | (1,134,189) | ​ | ​ | 37.01
Forfeited |  | (150,987) | ​ | ​ | 34.46
Unvested at June 30, 2025 |  | 3,818,644 | ​ | $ | 37.84
Schedule of share-based compensation expense recorded in the statement of operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Research and development | ​ | $ | 9,030 | ​ | $ | 9,428 | ​ | $ | 17,693 | ​ | $ | 18,395
Selling, general and administrative | ​ |  | 9,513 | ​ |  | 9,815 | ​ |  | 18,910 | ​ |  | 19,226
Total | ​ | $ | 18,543 | ​ | $ | 19,243 | ​ | $ | 36,603 | ​ | $ | 37,621
​

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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