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Fair value of financial instruments and investments - Available-for-sale securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses $ (12)  
Securities in an unrealized loss position less than 12 months - Fair Value 44,446  
Securities in an unrealized loss position greater than 12 months - Unrealized losses (2) $ (499)
Securities in an unrealized loss position greater than 12 months - Fair Value 1,648 10,186
Total - Unrealized losses (14) (499)
Total - Fair Value 46,094 10,186
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (12)  
Securities in an unrealized loss position less than 12 months - Fair Value 44,446  
Total - Unrealized losses (12)  
Total - Fair Value 44,446  
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position greater than 12 months - Unrealized losses (2) (499)
Securities in an unrealized loss position greater than 12 months - Fair Value 1,648 10,186
Total - Unrealized losses (2) (499)
Total - Fair Value $ 1,648 $ 10,186