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Stock award plan - Stock Option Activity (Details) - Stock option
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Number of options  
Outstanding at the beginning of the period (in shares) | shares 9,600,399
Granted (in shares) | shares 855,385
Exercised (in shares) | shares (109,892)
Forfeited/Cancelled (in shares) | shares (815,707)
Outstanding at the end of the period (in shares) | shares 9,530,185
Vested or Expected to vest at the end of the period (in shares) | shares 2,112,348
Exercisable at the end of the period (in shares) | shares 7,173,552
Weighted- average exercise price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 43.59
Granted (in dollars per share) | $ / shares 25.69
Exercised (in dollars per share) | $ / shares 19.22
Forfeited/Cancelled (in dollars per share) | $ / shares 45.32
Outstanding at the end of the period (in dollars per share) | $ / shares 42.12
Vested or Expected to vest at the end of the period (in dollars per share) | $ / shares 38.57
Exercisable at the end of the period (in dollars per share) | $ / shares $ 43.44
Weighted- average remaining contractual term  
Outstanding at the end of the period 5 years 10 months 24 days
Vested or Expected to vest at the end of the period 8 years 8 months 1 day
Exercisable at the end of the period 4 years 11 months 23 days
Aggregate intrinsic value (in thousands)  
Outstanding at the end of the period (in dollars) | $ $ 12,025
Vested or Expected to vest at the end of the period (in dollars) | $ 2,949
Exercisable at the end of the period (in dollars) | $ $ 8,598