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Loss Per Common Share - Antidilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive shares excluded from computation of weighted-average diluted common shares outstanding (in shares) 11,059,955 7,739,781
Restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive shares excluded from computation of weighted-average diluted common shares outstanding (in shares) 546,625 0
Warrants to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive shares excluded from computation of weighted-average diluted common shares outstanding (in shares) 0 413,320