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Short-term marketable securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 189,202	$ 239,171
Gross unrealized losses	(17)	(3)
Fair value	189,185	239,168
Cash equivalents	139,039	158,023
Short-term marketable securities	50,146	81,145
Total	$ 189,185	$ 239,168
Short-term contractual maturities	1 year	1 year
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 139,039	$ 158,023
Fair value	139,039	158,023
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	7,000	47,955
Fair value	7,000	47,955
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	43,163	33,193
Gross unrealized losses	(17)	(3)
Fair value	$ 43,146	$ 33,190

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