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Fair value of financial instruments and marketable securities - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair value of financial instruments and marketable securities
Amortized Cost	$ 970,573		$ 970,573		$ 330,684
Gross Unrealized, Gains	686		686		345
Gross Unrealized, Losses	(15)		(15)		(76)
Fair Value	971,244		971,244		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		$ 800		$ 800
Commercial paper
Fair value of financial instruments and marketable securities
Amortized Cost	106,556		106,556		44,780
Gross Unrealized, Gains	8		8
Gross Unrealized, Losses	(3)		(3)		(1)
Fair Value	106,561		106,561		44,779
Corporate debt securities
Fair value of financial instruments and marketable securities
Amortized Cost	243,257		243,257		89,320
Gross Unrealized, Gains	160		160		76
Gross Unrealized, Losses	(2)		(2)		(75)
Fair Value	243,415		243,415		89,321
Government obligations
Fair value of financial instruments and marketable securities
Amortized Cost	620,760		620,760		196,584
Gross Unrealized, Gains	518		518		269
Gross Unrealized, Losses	(10)		(10)
Fair Value	$ 621,268		$ 621,268		$ 196,853

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