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Net Loss Per Share - Schedule of Common Stock Equivalents Excluded from Computation of Diluted Loss per Share (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 6,501,571 5,639,793
Outstanding stock options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 5,131,263 3,693,943
Nonvested restricted stock and unit awards    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 1,153,364 1,230,651
Stock purchase warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 216,944 715,199