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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Common Shares Reserved for Future Issuance | The Company had reserved shares of common stock for possible future issuance as of December 31, 2018 and 2017 as follows:
| December 31,
| 2018 |  | 2017
Common stock warrants outstanding | 5,815,283 |  |  | 1,886,630 |
Stock options outstanding | 8,796,212 |  |  | 6,566,483 |
Restricted stock units outstanding | 454,382 |  |  | 1,055,977 |
Shares available for issuance pursuant to Convertible Notes | 40,649,225 |  |  | 40,649,225 |
Shares available for future grants of awards under the 2015 Incentive Compensation Plan | 1,943,085 |  |  | 1,973,537 |
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan | 3,224,425 |  |  | 3,816,243 |
Shares available under the 2000 Employee Stock Purchase Plan | 825,537 |  |  | 857,638 |
Total shares of common stock reserved for issuance | 61,708,149 |  |  | 56,805,733 |

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