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Stock Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 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 |  | 944,481 | ​ | $ | 5.83 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (16,202) | ​ | $ | 2.10 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (37,013) | ​ | $ | 21.87 | ​ | ​ | ​ | ​ | ​
Expired | ​ | (51) | ​ | $ | 115.80 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2022 | ​ | 2,237,948 | ​ | $ | 15.47 | ​ | 8.79 | ​ | $ | 3,292
Vested and exercisable at September 30, 2022 |  | 551,774 | ​ | $ | 30.09 | ​ | 7.97 | ​ | $ | 248

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