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Fair value of financial instruments and marketable securities - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 421,855		$ 421,855		$ 259,778
Gross Unrealized, Gain	39		39		340
Gross Unrealized, Loss	(269)		(269)		(14)
Fair Value	421,625		421,625		260,104
Write downs of available for sale debt securities	0	$ 0	0	$ 0
Increase in allowance for credit losses	0	0	0	0
Realized gain (loss) from sale of marketable securities	0	$ (300)	0	$ (300)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	133,081		133,081		117,044
Gross Unrealized, Gain					128
Gross Unrealized, Loss	(113)		(113)		(12)
Fair Value	132,968		132,968		117,160
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,906		14,906		1,650
Gross Unrealized, Loss	(7)		(7)		(2)
Fair Value	14,899		14,899		1,648
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	273,868		273,868		141,084
Gross Unrealized, Gain	39		39		212
Gross Unrealized, Loss	(149)		(149)
Fair Value	$ 273,758		$ 273,758		$ 141,296

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