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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,649		$ 1,649		$ 23,104
Gross Unrealized, Gain					5
Gross Unrealized, Loss	(24)		(24)		(499)
Fair Value	1,625		1,625		22,610
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	$ (1,300)	(300)	$ (1,600)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost					12,419
Gross Unrealized, Gain					5
Gross Unrealized, Loss					0
Fair Value					12,424
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,649		1,649		10,685
Gross Unrealized, Gain	0		0
Gross Unrealized, Loss	(24)		(24)		(499)
Fair Value	$ 1,625		$ 1,625		$ 10,186

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