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Fair value of financial instruments and marketable securities - Available-for-sale securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses $ (175) $ (76)
Securities in an unrealized loss position less than 12 months - Fair Value 508,204 89,360
Total - Unrealized losses (175) (76)
Total - Fair Value 508,204 89,360
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (42) (1)
Securities in an unrealized loss position less than 12 months - Fair Value 177,334 29,810
Total - Unrealized losses (42) (1)
Total - Fair Value 177,334 29,810
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (47) (75)
Securities in an unrealized loss position less than 12 months - Fair Value 141,853 59,550
Total - Unrealized losses (47) (75)
Total - Fair Value 141,853 $ 59,550
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (86)  
Securities in an unrealized loss position less than 12 months - Fair Value 189,017  
Total - Unrealized losses (86)  
Total - Fair Value $ 189,017