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Stock award plan - Stock Option Activity (Details) - Stock option
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
shares
Number of options  
Outstanding at the beginning of the period (in shares) | shares 8,482,489
Granted (in shares) | shares 802,745
Exercised (in shares) | shares (431,089)
Forfeited/Cancelled (in shares) | shares (320,327)
Outstanding at the end of the period (in shares) | shares 8,533,818
Expected to vest at the end of the period (in shares) | shares 1,802,150
Exercisable at the end of the period (in shares) | shares 6,512,960
Weighted- average exercise price  
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 42.29
Granted (in dollars per share) | $ / shares 46.74
Exercised (in dollars per share) | $ / shares 36.98
Forfeited/Cancelled (in dollars per share) | $ / shares 50.32
Outstanding at the end of the period (in dollars per share) | $ / shares 42.68
Vested or Expected to vest at the end of the period (in dollars per share) | $ / shares 38.47
Exercisable at the end of the period (in dollars per share) | $ / shares $ 43.96
Weighted- average remaining contractual term  
Outstanding at the end of the period 5 years 11 months 4 days
Vested or Expected to vest at the end of the period 8 years 9 months 21 days
Exercisable at the end of the period 5 years 7 days
Aggregate intrinsic value (in thousands)  
Outstanding at the end of the period (in dollars) | $ $ 91,932
Vested or Expected to vest at the end of the period (in dollars) | $ 22,683
Exercisable at the end of the period (in dollars) | $ $ 66,629