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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2023
Stock-based Compensation |
Summary of performance share units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding at 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 at March 31, 2023 | ​ | 503,880 | ​ | $ | 33.13
​
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding at December 31, 2022 | ​ | 2,047,571 | ​ | $ | 19.67
Granted | ​ | 1,093,296 | ​ | ​ | 26.82
Vested | ​ | (552,734) | ​ | ​ | 20.42
Forfeited | ​ | (132,214) | ​ | ​ | 21.66
Outstanding at March 31, 2023 | ​ | 2,455,919 | ​ | $ | 22.58
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted- |  | ​ | ​
​ | ​ | ​ |  | ​ | Weighted- |  | Average | ​ | ​ | ​
​ | ​ | ​ |  | ​ | Average |  | Remaining | ​ | ​ | Aggregate
​ | ​ | ​ | ​ | ​ | Exercise Price |  | Contractual | ​ | ​ | Intrinsic
​ |  | Shares |  | ​ | per Share |  | Term (in years) |  | ​ | Value
Outstanding at December 31, 2022 |  | 1,683,805 | ​ | $ | 18.84 |  | 5.5 | ​ | $ | 7,953
Exercised |  | (234,132) | ​ | ​ | 16.36 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (5,677) | ​ | ​ | 20.01 | ​ | ​ | ​ | ​ | ​
Outstanding at March 31, 2023 |  | 1,443,996 | ​ | $ | 19.24 |  | 5.0 | ​ | $ | 7,074
Exercisable at March 31, 2023 |  | 1,358,588 | ​ | $ | 19.20 | ​ | 4.9 | ​ | $ | 6,730
​
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended March 31,
​ | 2023 | ​ | 2022
Research and development | $ | — |  | $ | 1,591
Selling, general and administrative |  | 6,035 | ​ | ​ | 4,544
Total stock-based compensation expense | $ | 6,035 | ​ | $ | 6,135
​

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