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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 892,938	$ 397,776
Gross Unrealized, Gain	1,975	787
Gross Unrealized, Loss	(75)	(28)
Fair Value	894,838	398,535
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	276,855	157,936
Gross Unrealized, Gain	19	162
Gross Unrealized, Loss	(37)	0
Fair Value	276,837	158,098
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	474,030	188,778
Gross Unrealized, Gain	1,658	576
Gross Unrealized, Loss	(29)	(20)
Fair Value	475,659	189,334
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,681	51,062
Gross Unrealized, Gain	210	49
Gross Unrealized, Loss	(3)	(8)
Fair Value	28,888	$ 51,103
Government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	113,372
Gross Unrealized, Gain	88
Gross Unrealized, Loss	(6)
Fair Value	$ 113,454

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- 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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