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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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 937,566		$ 937,566		$ 330,684
Gross Unrealized, Gains	170		170		345
Gross Unrealized, Losses	(175)		(175)		(76)
Fair Value	937,561		937,561		330,953
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		$ 0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	177,376		177,376		44,780
Gross Unrealized, Losses	(42)		(42)		(1)
Fair Value	177,334		177,334		44,779
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	243,808		243,808		89,320
Gross Unrealized, Gains	34		34		76
Gross Unrealized, Losses	(47)		(47)		(75)
Fair Value	243,795		243,795		89,321
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	516,382		516,382		196,584
Gross Unrealized, Gains	136		136		269
Gross Unrealized, Losses	(86)		(86)
Fair Value	$ 516,432		$ 516,432		$ 196,853

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