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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Stock-Based Compensation |
Stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30,
​ | ​ | 2022 | ​ | 2021 | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands) | ​ | (in thousands)
Stock options | ​ | $ | 124 | ​ | $ | 74 | ​ | $ | 523 | ​ | $ | 436
Restricted stock units | ​ | ​ | 161 | ​ | ​ | 87 | ​ | ​ | 465 | ​ | ​ | 71
Performance stock units | ​ | ​ | 152 | ​ | ​ | - | ​ | ​ | 246 | ​ | ​ | -
Deferred stock units | ​ | ​ | 13 | ​ | ​ | (131) | ​ | ​ | 383 | ​ | ​ | 204
Total | ​ | $ | 450 | ​ | $ | 30 | ​ | $ | 1,617 | ​ | $ | 711

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