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(Loss) Earnings Per Share (Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded potential common shares from the computation of diluted net loss per share 3,373,464 12,999,875
Options to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded potential common shares from the computation of diluted net loss per share 2,657,333 961,885
Warrants to purchase redeemable convertible preferred stock (as converted to common stock)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded potential common shares from the computation of diluted net loss per share   108,406
Warrants to purchase common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded potential common shares from the computation of diluted net loss per share 716,131  
Redeemable convertible preferred stock (as converted to common stock)    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Excluded potential common shares from the computation of diluted net loss per share   11,929,584