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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Write downs of available for sale debt securities	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	53	53	$ 28
Amortized Cost	704,653	704,653	397,776
Gross Unrealized, Gain	2,449	2,449	787
Gross Unrealized, Loss	(53)	(53)	(28)
Fair Value	707,049	707,049	398,535
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	53	53	28
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16	16
Amortized Cost	260,392	260,392	157,936
Gross Unrealized, Gain	74	74	162
Gross Unrealized, Loss	(16)	(16)	0
Fair Value	260,450	260,450	158,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	16	16
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	19	19	20
Amortized Cost	316,198	316,198	188,778
Gross Unrealized, Gain	2,082	2,082	576
Gross Unrealized, Loss	(19)	(19)	(20)
Fair Value	318,261	318,261	189,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	19	19	20
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	2	2	8
Amortized Cost	35,461	35,461	51,062
Gross Unrealized, Gain	232	232	49
Gross Unrealized, Loss	(2)	(2)	(8)
Fair Value	35,691	35,691	51,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2	2	$ 8
Government obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16	16
Amortized Cost	92,602	92,602
Gross Unrealized, Gain	61	61
Gross Unrealized, Loss	(16)	(16)
Fair Value	92,647	92,647
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 16	$ 16

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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