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Short-term marketable securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 224,442	$ 239,171
Gross unrealized losses	(2)	(3)
Fair value	224,440	239,168
Cash equivalents	162,416	158,023
Short-term marketable securities	62,024	81,145
Total	224,440	239,168
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	162,416	158,023
Fair value	162,416	158,023
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	33,976	47,955
Fair value	33,976	47,955
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	28,050	33,193
Gross unrealized losses	(2)	(3)
Fair value	$ 28,048	$ 33,190

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- Definition

Amount of unrealized loss 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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investment in marketable security.

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Amount of investment in marketable security, classified as current.

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