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Net loss per common stock
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Net loss per common stock Net loss per common stock
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,
20222021
Outstanding stock options8,514,381 8,963,945 
Restricted stock units378,500 132,000 
Shares issuable under 2020 ESPP49,251 53,446 
8,942,132 9,149,391