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Net loss per common stock (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Securities Excluded From Computation of Earnings Per Share
The Company excluded the following potentially dilutive shares from diluted net loss per share as the effect would have been anti-dilutive for all periods presented:
December 31,YEARS ENDED
20202019
Outstanding stock options6,848,289 5,840,538 
Restricted stock units186,500 72,000 
Shares issuable under 2020 ESPP22,521 — 
7,057,310 5,912,538