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Common Stock Warrants | 3 Months Ended
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Mar. 31, 2019
Warrants And Rights Note Disclosure [Abstract] |
Common Stock Warrants | 10. Common Stock Warrants As of March 31, 2019 and December 31, 2018, the following common stock warrants were outstanding:
|  |  |  |  |  | Exercise Price |  |  | March 31, |  |  | December 31, |
Issuance Date |  | Expiration Date |  | Balance Sheet Classification |  | per Share |  |  | 2019 |  |  | 2018 |
February 2015 |  | February 2020 |  | Stockholders' equity |  | $ | 66.20 |  |  |  | 9,063 |  |  |  | 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 |  |  |  | — |
|  |  |  |  |  |  |  |  |  |  | 28,489 |  |  |  | 23,644 |

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