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Net Loss Per Share | 6 Months Ended
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Jun. 30, 2021
Net Loss Per Share |
Net Loss Per Share | 16. Net Loss Per Share The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share due to their anti-dilutive effect: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
​ |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
Stock options to purchase common stock |  | 3,560,541 |  | 2,399,195 | ​ | 3,560,541 | ​ | 2,399,195
Unvested restricted stock units |  | — |  | 425,799 | ​ | — | ​ | 425,799
Convertible promissory notes |  | — |  | 2,133,019 | ​ | — | ​ | 2,133,019
Total |  | 3,560,541 |  | 4,958,013 | ​ | 3,560,541 | ​ | 4,958,013
​

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