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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 10,689		$ 23,104
Gross Unrealized, Gain			5
Gross Unrealized, Loss	(440)		(499)
Fair Value	10,249		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	0	$ (100)
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	10,689		10,685
Gross Unrealized, Gain	0
Gross Unrealized, Loss	(440)		(499)
Fair Value	$ 10,249		$ 10,186

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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