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Common Stock Warrants | 6 Months Ended
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Jun. 30, 2018
Warrants And Rights Note Disclosure [Abstract] |
Common Stock Warrants | 9. Common Stock Warrants As of June 30, 2018 and December 31, 2017, the following common stock warrants were outstanding:
|  |  |  |  |  | Exercise Price |  |  | June 30, |  |  | December 31, |
Issuance Date |  | Expiration Date |  | Balance Sheet Classification |  | per Share |  |  | 2018 |  |  | 2017 |
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 |  |  |  | - |
|  |  |  |  |  |  |  |  |  |  | 23,644 |  |  |  | 17,312 |

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