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Stock-based compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Number of shares          
Outstanding as of December 31, 2020 (in shares)     3,604,584    
Granted (in shares)     1,732,182    
Exercised (in shares)     (111,149)    
Expired (in shares)     (34,447)    
Forfeited (in shares)     (667,866)    
Outstanding as of September 30, 2021 (in shares) 4,523,304   4,523,304   3,604,584
Options vested and expected to vest as of September 30, 2021 (in shares) 4,523,304   4,523,304    
Options exercisable as of September 30, 2021 (in shares) 2,134,381   2,134,381    
Weighted average exercise price          
Outstanding as of December 31, 2020 (in dollars per share)     $ 0.92    
Granted (in dollars per share)     9.15    
Exercised (in dollars per share)     2.67    
Expired (in dollars per share)     1.00    
Forfeited (in dollars per share)     2.12    
Outstanding as of September 30, 2021 (in dollars per share) $ 3.88   3.88   $ 0.92
Options vested and expected to vest as of September 30, 2021 (in dollars per share) 3.88   3.88    
Options exercisable as of September 30, 2021 (in dollars per share) $ 1.25   $ 1.25    
Weighted average remaining contractual term          
Weighted average remaining contractual term (in years)     7 years 8 months 4 days   8 years 1 month 13 days
Options vested and expected to vest (in years)     7 years 8 months 4 days    
Options exercisable (in years)     6 years 2 months 1 day    
Aggregate intrinsic value          
Aggregate intrinsic value $ 66,231   $ 66,231   $ 4,272
Options vested and expected to vest 66,231   66,231    
Options exercisable $ 36,777   $ 36,777    
Exercised       $ 0  
Weighted average grant-date fair value $ 8.33 $ 0.55 $ 4.05 $ 0.55