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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 and 2020 as follows:
 December 31,
  20212020
Common stock warrants outstanding2,500,000 2,500,000 
Stock options outstanding 8,085,793 8,479,979 
Restricted stock units outstanding1,247,723 417,105 
Shares available for issuance pursuant to Convertible Notes14,340,786 15,879,948 
Shares available for future grants of awards under the 2018 Omnibus Incentive Compensation Plan3,311,023 2,849,488 
Shares available under the 2000 Employee Stock Purchase Plan170,811 391,201 
Total shares of common stock reserved for issuance29,656,136 30,517,721