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Net Loss per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share The shares in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect:
 As of September 30,
 20212020
Warrant509,611 509,611 
Outstanding stock options11,593,539 10,681,764 
Unvested restricted stock units5,378,916 4,971,679 
Total17,482,066 16,163,054