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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2025
Stock Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted |  | Weighted | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number of | ​ | Price | ​ | Remaining Term | ​ | Value
​ | ​ | shares | ​ | Per Share | ​ | (in years) | ​ | (in thousands)
Outstanding as of January 1, 2025 | ​ | ​ | 2,426,929 | ​ | $ | 20.83 |  | ​ | 5.77 | ​ | $ | 18,644
Granted |  | ​ | — | ​ |  | — |  | ​ | ​ |  | ​ |
Exercised |  | ​ | (21,000) | ​ |  | 4.03 |  | ​ | ​ |  | ​ |
Forfeited, expired or cancelled | ​ | ​ | (31,234) | ​ |  | 76.55 |  | ​ | ​ |  | ​ |
Outstanding as of March 31, 2025 | ​ | ​ | 2,374,695 | ​ | $ | 20.24 |  | ​ | 5.63 | ​ | $ | 8,266
Exercisable as of March 31, 2025 | ​ | ​ | 2,069,546 | ​ | $ | 19.69 |  | ​ | 5.32 | ​ | $ | 8,050
Schedule of grant date fair values of PSUs granted | The grant date fair values of the PSUs granted in January 2024 was estimated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Derived
Hurdle Price | ​ | Number of | ​ | Fair Value | ​ | Service Period
Per PSU | ​ | PSUs | ​ | Per Share | ​ | (in years)
$ | 30.00 | ​ | ​ | 160,078 |  | $ | 18.42 | ​ | ​ | 0.74
$ | 35.00 | ​ | ​ | 53,350 |  | $ | 17.24 | ​ | ​ | 0.96
$ | 40.00 | ​ | ​ | 32,835 |  | $ | 16.14 | ​ | ​ | 1.15
$ | 45.00 | ​ | ​ | 28,737 | ​ | $ | 15.13 | ​ | ​ | 1.31
​ | ​ | ​ | ​ | 275,000 |  | ​ | ​ | ​ | ​ | ​
​
Schedule of performance shares, outstanding activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Number of | ​ | Fair Value
​ | ​ | Unvested PSUs | ​ | Per Share
Unvested balance as of January 1, 2025 | ​ | ​ | 597,117 | ​ | $ | 16.03
Granted |  | ​ | — | ​ |  | —
Vested |  | ​ | — | ​ |  | —
Forfeited | ​ | ​ | — | ​ |  | —
Unvested balance as of March 31, 2025 | ​ | ​ | 597,117 | ​ | $ | 16.03
Summary of stock-based compensation expense | The following table shows total stock-based compensation expense for stock options, PSUs, RSUs, and ESPP in the condensed consolidated statements of operations (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ | ​ | 2025 | ​ | 2024
Total stock-based compensation expense | ​ | $ | 1,983 | ​ | $ | 2,856
​

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