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Stockholders' Equity (Tables)
 12 Months Ended
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,
  20202019
Common stock warrants outstanding2,500,000 2,838,454 
Stock options outstanding 8,479,979 9,044,304 
Restricted stock units outstanding417,105 400,315 
Shares available for issuance pursuant to Convertible Notes15,879,948 40,649,225 
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan2,849,488 2,488,221 
Shares available under the 2000 Employee Stock Purchase Plan391,201 622,476 
Total shares of common stock reserved for issuance30,517,721 56,042,995