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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Common Stock are Reserved for Future Issuance | Shares of common stock reserved for future issuance are as follows (in thousands):
| December 31, 2018
Warrants outstanding | 17,698 |
Stock options outstanding | 395 |
Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan | 421 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 115 |
Restricted stock units | 13 |
Total reserved for future issuance | 18,642 |

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