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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Write downs of available for sale debt securities	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	144	$ 75
Amortized Cost	641,471	892,938
Gross Unrealized, Gain	750	1,975
Gross Unrealized, Loss	(144)	(75)
Fair Value	642,077	894,838
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	144	75
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	37
Amortized Cost	252,778	276,855
Gross Unrealized, Gain	25	19
Gross Unrealized, Loss	(1)	(37)
Fair Value	252,802	276,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	37
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	139	29
Amortized Cost	330,781	474,030
Gross Unrealized, Gain	591	1,658
Gross Unrealized, Loss	(139)	(29)
Fair Value	331,233	475,659
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	139	29
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		3
Amortized Cost	19,216	28,681
Gross Unrealized, Gain	104	210
Gross Unrealized, Loss		(3)
Fair Value	19,320	28,888
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		3
Government obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	6
Amortized Cost	38,696	113,372
Gross Unrealized, Gain	30	88
Gross Unrealized, Loss	(4)	(6)
Fair Value	38,722	113,454
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4	$ 6

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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