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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2	$ 28
Amortized Cost	337,021	397,776
Gross Unrealized, Gain	3,411	787
Gross Unrealized, Loss	(2)	(28)
Fair Value	340,430	398,535
Securities in an unrealized loss position less than 12 months	9,196	95,990
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Securities in an unrealized loss position greater than 12 months	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2	28
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	9,196	95,990
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	53,638	157,936
Gross Unrealized, Gain	178	162
Gross Unrealized, Loss	0	0
Fair Value	53,816	158,098
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		20
Amortized Cost	221,068	188,778
Gross Unrealized, Gain	2,882	576
Gross Unrealized, Loss	0	(20)
Fair Value	223,950	189,334
Securities in an unrealized loss position less than 12 months		71,779
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Securities in an unrealized loss position greater than 12 months		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		20
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value		71,779
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	1	8
Amortized Cost	44,492	51,062
Gross Unrealized, Gain	332	49
Gross Unrealized, Loss	(1)	(8)
Fair Value	44,823	51,103
Securities in an unrealized loss position less than 12 months	594	24,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Securities in an unrealized loss position greater than 12 months	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1	8
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	594	$ 24,211
Government obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1
Amortized Cost	17,823
Gross Unrealized, Gain	19
Gross Unrealized, Loss	(1)
Fair Value	17,841
Securities in an unrealized loss position less than 12 months	8,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Securities in an unrealized loss position greater than 12 months	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	$ 8,602

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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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