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Stock-based compensation - Activity Under Stock Option Plan (Details)
 9 Months Ended
Sep. 30, 2024
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 10,902,845
Granted (in shares) | shares 2,687,497
Exercised (in shares) | shares (14,223)
Cancelled/forfeited (in shares) | shares (1,048,874)
Outstanding at end of period (in shares) | shares 12,527,245
Exercisable, at end of period (in shares) | shares 7,716,813
Weighted- Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 7.42
Granted (in dollars per share) | $ / shares 2.91
Exercised (in dollars per share) | $ / shares 3.25
Cancelled/forfeited (in dollars per share) | $ / shares 7.98
Outstanding at end of period (in dollars per share) | $ / shares 6.41
Exercisable, at end of period (in dollars per share) | $ / shares $ 7.81