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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Unrealized losses
Securities in an unrealized loss position less than 12 months	$ (2)	$ (28)
Securities in an unrealized loss position greater than 12 months	0	0
Total	(2)	(28)
Fair Value
Securities in an unrealized loss position less than 12 months	9,196	95,990
Securities in an unrealized loss position greater than 12 months	0	0
Total	9,196	95,990
Corporate debt securities
Unrealized losses
Securities in an unrealized loss position less than 12 months		(20)
Securities in an unrealized loss position greater than 12 months		0
Total		(20)
Fair Value
Securities in an unrealized loss position less than 12 months		71,779
Securities in an unrealized loss position greater than 12 months		0
Total		71,779
Asset-backed securities
Unrealized losses
Securities in an unrealized loss position less than 12 months	(1)	(8)
Securities in an unrealized loss position greater than 12 months	0	0
Total	(1)	(8)
Fair Value
Securities in an unrealized loss position less than 12 months	594	24,211
Securities in an unrealized loss position greater than 12 months	0	0
Total	594	$ 24,211
Government obligations
Unrealized losses
Securities in an unrealized loss position less than 12 months	(1)
Securities in an unrealized loss position greater than 12 months	0
Total	(1)
Fair Value
Securities in an unrealized loss position less than 12 months	8,602
Securities in an unrealized loss position greater than 12 months	0
Total	$ 8,602

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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