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Common Stock Warrants | 3 Months Ended
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Mar. 31, 2020
Common Stock Warrants |
Common Stock Warrants | 9. Common Stock Warrants As of March 31, 2020 and December 31, 2019, the following common stock warrants were outstanding:
|  |  |  |  |  | Exercise Price |  | March 31, |  | December 31,
Issuance Date |  | Expiration Date |  | Balance Sheet Classification |  | per Share |  | 2020 |  | 2019
February 2015 |  | February 2020 |  | Stockholders’ equity |  | $ | 66.20 |  | — |  | 9,063
February 2016 |  | February 2021 |  | Stockholders’ equity |  | $ | 15.40 |  | 8,249 |  | 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
|  |  |  |  |  |  |  |  | 19,426 |  | 28,489

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