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Stock Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2022
Stock Incentive Plans |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Weighted- | ​ | Remaining | ​ | Intrinsic
​ | ​ | ​ | ​ | Average | ​ | Contractual | ​ | Value
​ |  | Shares |  | Exercise Price |  | Term (years) |  | (in thousands)
Outstanding at December 31, 2021 |  | 1,346,733 | ​ | $ | 22.25 |  | 9.02 | ​ | $ | 168
Granted |  | 650,150 | ​ | $ | 6.48 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (34,233) | ​ | $ | 17.56 | ​ | ​ | ​ | ​ | ​
Outstanding at March 31, 2022 | ​ | 1,962,650 | ​ | $ | 17.11 | ​ | 9.14 | ​ | $ | 381
Vested and exercisable at March 31, 2022 |  | 175,632 | ​ | $ | 58.41 | ​ | 7.27 | ​ | $ | 228

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