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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019 as follows:
| December 31,
| 2020 |  | 2019
Common stock warrants outstanding | 2,500,000 |  |  | 2,838,454 |
Stock options outstanding | 8,479,979 |  |  | 9,044,304 |
Restricted stock units outstanding | 417,105 |  |  | 400,315 |
Shares available for issuance pursuant to Convertible Notes | 15,879,948 |  |  | 40,649,225 |
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan | 2,849,488 |  |  | 2,488,221 |
Shares available under the 2000 Employee Stock Purchase Plan | 391,201 |  |  | 622,476 |
Total shares of common stock reserved for issuance | 30,517,721 |  |  | 56,042,995 |

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