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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Stock-based Compensation |
Summary of performance share units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding at December 31, 2021 | ​ | 353,100 | ​ | $ | 31.77
Granted | ​ | 241,550 | ​ | ​ | 24.12
Vested | ​ | (126,081) | ​ | ​ | 29.12
Forfeited | ​ | (22,104) | ​ | ​ | 29.60
Performance adjustment | ​ | 1,305 | ​ | ​ | 28.96
Outstanding at September 30, 2022 | ​ | 447,770 | ​ | $ | 28.71
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding at December 31, 2021 | ​ | 1,620,023 | ​ | $ | 22.48
Granted | ​ | 1,272,497 | ​ | ​ | 17.48
Vested | ​ | (565,669) | ​ | ​ | 21.93
Forfeited | ​ | (366,691) | ​ | ​ | 20.58
Outstanding at September 30, 2022 | ​ | 1,960,160 | ​ | $ | 19.75
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, 2021 |  | 2,728,169 | ​ | $ | 18.33 |  | 5.8 | ​ | $ | 6,070
Granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Exercised |  | (302,752) | ​ | ​ | 16.34 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (268,916) | ​ | ​ | 21.38 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2022 |  | 2,156,501 | ​ | $ | 18.23 |  | 5.4 | ​ | $ | 2,142
Exercisable at September 30, 2022 |  | 1,969,414 | ​ | $ | 18.18 | ​ | 5.2 | ​ | $ | 2,023
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021
Research and development | $ | — |  | $ | 233 | ​ | $ | 1,591 |  | $ | 2,697
Selling, general and administrative |  | 5,377 | ​ | ​ | 5,715 | ​ |  | 15,613 | ​ | ​ | 16,646
Total stock-based compensation expense | $ | 5,377 | ​ | $ | 5,948 | ​ | $ | 17,204 | ​ | $ | 19,343

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