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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 397,776	$ 58,056
Gross Unrealized Gains	787	43
Gross Unrealized Losses	(28)	(11)
Fair Value	398,535	58,088
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	157,936	31,657
Gross Unrealized Gains	162	43
Gross Unrealized Losses	0	(1)
Fair Value	158,098	31,699
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	188,778	26,399
Gross Unrealized Gains	576	0
Gross Unrealized Losses	(20)	(10)
Fair Value	189,334	$ 26,389
Asset-backed securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	51,062
Gross Unrealized Gains	49
Gross Unrealized Losses	(8)
Fair Value	$ 51,103

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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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