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Stock award plan - Stock Option Activity (Details) - Stock option
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
$ / shares
shares
Number of options  
Outstanding at the beginning of the period (in shares) | shares 11,502,417
Granted (in shares) | shares 863,410
Exercised (in shares) | shares (211,561)
Forfeited/Cancelled (in shares) | shares (53,716)
Outstanding at the end of the period (in shares) | shares 12,100,550
Vested or Expected to vest at the end of the period (in shares) | shares 3,387,505
Exercisable at the end of the period (in shares) | shares 8,348,132
Weighted- average exercise price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 43.33
Granted (in dollars per share) | $ / shares 39.93
Exercised (in dollars per share) | $ / shares 28.61
Forfeited/Cancelled (in dollars per share) | $ / shares 52.25
Outstanding at the end of the period (in dollars per share) | $ / shares 43.30
Vested or Expected to vest at the end of the period (in dollars per share) | $ / shares 47.15
Exercisable at the end of the period (in dollars per share) | $ / shares $ 41.68
Weighted- average remaining contractual term  
Outstanding at the end of the period 6 years 4 months 17 days
Vested or Expected to vest at the end of the period 8 years 5 months 8 days
Exercisable at the end of the period 5 years 5 months 8 days
Aggregate intrinsic value (in thousands)  
Outstanding at the end of the period (in dollars) | $ $ 102,959
Vested or Expected to vest at the end of the period (in dollars) | $ 19,149
Exercisable at the end of the period (in dollars) | $ $ 81,335