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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 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 December 31, 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 | ​ | 1,372,247 | ​ | ​ | 17.53
Vested | ​ | (573,204) | ​ | ​ | 21.89
Forfeited | ​ | (371,495) | ​ | ​ | 20.57
Outstanding at December 31, 2022 | ​ | 2,047,571 | ​ | $ | 19.67
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
Exercised |  | (742,348) | ​ | ​ | 15.93 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (302,016) | ​ | ​ | 21.35 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2022 |  | 1,683,805 | ​ | $ | 18.84 |  | 5.5 | ​ | $ | 7,953
Exercisable at December 31, 2022 |  | 1,545,610 | ​ | $ | 18.82 |  | 5.4 | ​ | $ | 7,394
​
Schedule of fair value assumption using Black-Scholes option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Years Ended December 31,
​ | 2022 | ​ | 2021 | ​ | 2020
Risk-free interest rate | — | % | ​ | 0.7 | % | ​ | 1.3 | %
Volatility | — | % | ​ | 67.2 | % | ​ | 66.2 | %
Expected term (years) | — | ​ | ​ | 6.0 | ​ | ​ | 6.0 | ​
Expected dividend yield | — | % | ​ | — | % | ​ | — | %
​
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Years Ended December 31,
​ | 2022 | ​ | 2021 | ​ | 2020
Research and development | $ | 1,591 |  | ​ | 3,422 |  | ​ | 3,909
Selling, general and administrative |  | 21,283 | ​ | ​ | 20,833 | ​ | ​ | 18,001
Total stock-based compensation expense | $ | 22,874 | ​ | $ | 24,255 | ​ | $ | 21,910

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