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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 as follows:
| December 31,
| 2019 |  | 2018
Common stock warrants outstanding | 2,838,454 |  |  | 5,815,283 |
Stock options outstanding | 9,044,304 |  |  | 8,796,212 |
Restricted stock units outstanding | 400,315 |  |  | 454,382 |
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 | 4,557 |  |  | 1,943,085 |
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan | 2,483,664 |  |  | 3,224,425 |
Shares available under the 2000 Employee Stock Purchase Plan | 622,476 |  |  | 825,537 |
Total shares of common stock reserved for issuance | 56,042,995 |  |  | 61,708,149 |

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