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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,648		$ 1,648		$ 23,104
Gross Unrealized, Gain					5
Gross Unrealized, Loss	(43)		(43)		(499)
Fair Value	1,605		1,605		22,610
Write downs of available for sale debt securities	0		0
Increase in allowance for credit losses	0	$ 0	0	$ 0
Realized gain (loss) from sale of marketable securities	(300)	$ (300)	(300)	$ (400)
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	1,648		1,648		10,685
Gross Unrealized, Gain	0		0
Gross Unrealized, Loss	(43)		(43)		(499)
Fair Value	$ 1,605		$ 1,605		$ 10,186

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