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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Common Stock are Reserved for Future Issuance | Shares of common stock for future issuance are reserved for as follows (in thousands):
| September 30, 2018
Warrants outstanding | 19,224 |
Stock options outstanding | 434 |
Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan | 381 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 115 |
Restricted stock units | 13 |
Total reserved for future issuance | 20,167 |

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