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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Stock-based Compensation |
Summary of performance share units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding as of December 31, 2022 | ​ | 447,770 | ​ | $ | 28.71
Granted | ​ | 216,500 | ​ | ​ | 38.71
Vested | ​ | (223,170) | ​ | ​ | 27.99
Forfeited | ​ | — | ​ | ​ | —
Performance adjustment | ​ | 62,780 | ​ | ​ | 27.14
Outstanding as of September 30, 2023 | ​ | 503,880 | ​ | $ | 33.13
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding as of December 31, 2022 | ​ | 2,047,571 | ​ | $ | 19.67
Granted | ​ | 1,268,907 | ​ | ​ | 26.27
Vested | ​ | (644,746) | ​ | ​ | 19.90
Forfeited | ​ | (179,711) | ​ | ​ | 21.85
Outstanding as of September 30, 2023 | ​ | 2,492,021 | ​ | $ | 22.81
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted- |  | ​ | ​
​ | ​ | ​ |  | ​ | Weighted- |  | Average | ​ | ​ | ​
​ | ​ | ​ |  | ​ | Average |  | Remaining | ​ | ​ | Aggregate
​ | ​ | ​ | ​ | ​ | Exercise Price |  | Contractual | ​ | ​ | Intrinsic
​ |  | Shares |  | ​ | per Share |  | Term (in years) |  | ​ | Value
Outstanding as of December 31, 2022 |  | 1,683,805 | ​ | $ | 18.84 |  | 5.5 | ​ | $ | 7,953
Exercised |  | (327,722) | ​ | ​ | 16.43 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (8,923) | ​ | ​ | 18.87 | ​ | ​ | ​ | ​ | ​
Outstanding as of September 30, 2023 |  | 1,347,160 | ​ | $ | 19.43 |  | 4.7 | ​ | $ | 4,952
Exercisable as of September 30, 2023 |  | 1,310,344 | ​ | $ | 19.38 | ​ | 4.6 | ​ | $ | 4,910
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
Research and development | $ | — |  | $ | — | ​ | $ | — |  | $ | 1,591
Selling, general and administrative |  | 7,027 | ​ | ​ | 5,377 | ​ |  | 20,134 | ​ | ​ | 15,613
Total stock-based compensation expense | $ | 7,027 | ​ | $ | 5,377 | ​ | $ | 20,134 | ​ | $ | 17,204

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