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Net Loss Per Common Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share The following outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:
 Three Months Ended March 31,
 20202019
Shares of common stock subject to outstanding options4,760,128  5,670,819  
Employee stock purchase plan19,857  25,672  
Restricted stock units936,524  538,759  
Total common stock equivalents5,716,509  6,235,250