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Fair value of financial instruments and investments - Available-for-sale securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses $ (3,402) $ (673)
Securities in an unrealized loss position less than 12 months - Fair Value 227,918 256,801
Securities in an unrealized loss position greater than 12 months - Unrealized losses (143) (36)
Securities in an unrealized loss position greater than 12 months - Fair Value 4,876 4,985
Total - Unrealized losses (3,545) (709)
Total - Fair Value 232,794 261,786
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (11) (1)
Securities in an unrealized loss position less than 12 months - Fair Value 27,281 12,992
Total - Unrealized losses (11) (1)
Total - Fair Value 27,281 12,992
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (2,996) (608)
Securities in an unrealized loss position less than 12 months - Fair Value 174,146 217,540
Securities in an unrealized loss position greater than 12 months - Unrealized losses (143) (36)
Securities in an unrealized loss position greater than 12 months - Fair Value 4,876 4,985
Total - Unrealized losses (3,139) (644)
Total - Fair Value 179,022 222,525
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (37) (5)
Securities in an unrealized loss position less than 12 months - Fair Value 8,435 10,786
Total - Unrealized losses (37) (5)
Total - Fair Value 8,435 10,786
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Securities in an unrealized loss position less than 12 months - Unrealized losses (358) (59)
Securities in an unrealized loss position less than 12 months - Fair Value 18,056 15,483
Total - Unrealized losses (358) (59)
Total - Fair Value $ 18,056 $ 15,483