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Common Stock Warrants | 6 Months Ended
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Jun. 30, 2021
Common Stock Warrants |
Common Stock Warrants | 9. Common Stock Warrants As of June 30, 2021 and December 31, 2020, the following common stock warrants were outstanding: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Exercise Price |  | June 30, |  | December 31,
Issuance Date | ​ | Expiration Date | ​ | Balance Sheet Classification | ​ | per Share | ​ | 2021 | ​ | 2020
February 2016 |  | February 2021 |  | Stockholders’ equity | ​ | $ | 15.40 |  | — |  | 8,249
May 2018 |  | May 2028 |  | Stockholders’ equity | ​ | $ | 23.69 |  | 6,332 |  | 6,332
March 2019 | ​ | March 2029 | ​ | Stockholders’ equity | ​ | $ | 14.71 | ​ | 4,845 | ​ | 4,845
​ |  |  |  |  | ​ |  |  |  | 11,177 |  | 19,426
​ During the first quarter of 2021, the Company issued 4,917 shares of common stock through a cashless exercise of the February 2016 common stock warrants held by Torreya Partners LLC.

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