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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, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 23,104	$ 377,287
Gross Unrealized, Gain	5	107
Gross Unrealized, Loss	(499)	(709)
Fair Value	22,610	376,685
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	4,000	800
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,419	75,275
Gross Unrealized, Gain	5	5
Gross Unrealized, Loss	0	(1)
Fair Value	12,424	75,279
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,685	268,246
Gross Unrealized, Gain	0	81
Gross Unrealized, Loss	(499)	(644)
Fair Value	$ 10,186	267,683
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		15,287
Gross Unrealized, Gain		16
Gross Unrealized, Loss		(5)
Fair Value		15,298
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		18,479
Gross Unrealized, Gain		5
Gross Unrealized, Loss		(59)
Fair Value		$ 18,425

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- Definition

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