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Fair value of financial instruments and marketable securities - Available-for-sale securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair value of financial instruments and marketable securities    
Securities in an unrealized loss position less than 12 months - Unrealized losses $ (15) $ (76)
Securities in an unrealized loss position less than 12 months - Fair Value 134,351 89,360
Total - Unrealized losses (15) (76)
Total - Fair Value 134,351 89,360
Commercial paper    
Fair value of financial instruments and marketable securities    
Securities in an unrealized loss position less than 12 months - Unrealized losses (3) (1)
Securities in an unrealized loss position less than 12 months - Fair Value 59,850 29,810
Total - Unrealized losses (3) (1)
Total - Fair Value 59,850 29,810
Corporate debt securities    
Fair value of financial instruments and marketable securities    
Securities in an unrealized loss position less than 12 months - Unrealized losses (2) (75)
Securities in an unrealized loss position less than 12 months - Fair Value 44,500 59,550
Total - Unrealized losses (2) (75)
Total - Fair Value 44,500 $ 59,550
Government obligations    
Fair value of financial instruments and marketable securities    
Securities in an unrealized loss position less than 12 months - Unrealized losses (10)  
Securities in an unrealized loss position less than 12 months - Fair Value 30,001  
Total - Unrealized losses (10)  
Total - Fair Value $ 30,001