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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 471,944	$ 892,938
Gross Unrealized, Gain	436	1,975
Gross Unrealized, Loss	(42)	(75)
Fair Value	472,338	894,838
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109,890	276,855
Gross Unrealized, Gain	20	19
Gross Unrealized, Loss	0	(37)
Fair Value	109,910	276,837
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	281,467	474,030
Gross Unrealized, Gain	351	1,658
Gross Unrealized, Loss	(37)	(29)
Fair Value	281,781	475,659
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,704	28,681
Gross Unrealized, Gain	45	210
Gross Unrealized, Loss	(1)	(3)
Fair Value	20,748	28,888
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,883	113,372
Gross Unrealized, Gain	20	88
Gross Unrealized, Loss	(4)	(6)
Fair Value	$ 59,899	$ 113,454

X

- Definition

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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