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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 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 December 31, 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 | ​ | 1,278,256 | ​ | ​ | 26.25
Vested | ​ | (675,647) | ​ | ​ | 19.83
Forfeited | ​ | (206,273) | ​ | ​ | 21.91
Outstanding as of December 31, 2023 | ​ | 2,443,907 | ​ | $ | 22.88
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 |  | (498,008) | ​ | ​ | 17.34 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (9,047) | ​ | ​ | 18.90 | ​ | ​ | ​ | ​ | ​
Outstanding as of December 31, 2023 |  | 1,176,750 | ​ | $ | 19.48 |  | 4.3 | ​ | $ | 13,297
Exercisable as of December 31, 2023 |  | 1,158,209 | ​ | $ | 19.45 |  | 4.3 | ​ | $ | 13,120
Schedule of fair value assumption using Black-Scholes option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Years Ended December 31,
​ | 2023 | ​ | 2022 | ​ | 2021
Risk-free interest rate | — | % | ​ | — | % | ​ | 0.7 | %
Volatility | — | % | ​ | — | % | ​ | 67.2 | %
Expected term (years) | — | ​ | ​ | — | ​ | ​ | 6.0 | ​
Expected dividend yield | — | % | ​ | — | % | ​ | — | %
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Years Ended December 31,
​ | 2023 | ​ | 2022 | ​ | 2021
Research and development | $ | — |  | $ | 1,591 |  | $ | 3,422
Selling, general and administrative |  | 27,136 | ​ | ​ | 21,283 | ​ | ​ | 20,833
Total stock-based compensation expense | $ | 27,136 | ​ | $ | 22,874 | ​ | $ | 24,255
​

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