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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 259,778	$ 23,104
Gross Unrealized, Gain	340	5
Gross Unrealized, Loss	(14)	(499)
Fair Value	260,104	22,610
Write downs of available for sale debt securities	0	0
Increase in allowance for credit losses	0	0
Realized gain (loss) from sale of marketable securities	(300)	4,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	117,044	12,419
Gross Unrealized, Gain	128	5
Gross Unrealized, Loss	(12)	0
Fair Value	117,160	12,424
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,650	10,685
Gross Unrealized, Gain	0	0
Gross Unrealized, Loss	(2)	(499)
Fair Value	1,648	$ 10,186
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	141,084
Gross Unrealized, Gain	212
Gross Unrealized, Loss	0
Fair Value	$ 141,296

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