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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Stock-Based Compensation |
Stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the three months ended September 30, | ​ | For the nine months ended September 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​
​ | ​ | (in thousands) | ​ | (in thousands) | ​
Stock options | ​ | $ | 74 | ​ | $ | 140 | ​ | $ | 436 | ​ | $ | 535 | ​
Restricted stock units | ​ | ​ | 87 | ​ | ​ | 165 | ​ | ​ | 71 | ​ | ​ | 640 | ​
Deferred stock units | ​ | ​ | (131) | ​ | ​ | - | ​ | ​ | 204 | ​ | ​ | - | ​
Total | ​ | $ | 30 | ​ | $ | 305 | ​ | $ | 711 | ​ | $ | 1,175 | ​

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