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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 226,801	$ 58,056
Gross Unrealized, Gain	656	43
Gross Unrealized, Loss	(10)	(11)
Fair Value	227,447	58,088
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	70,185	31,657
Gross Unrealized, Gain	116	43
Gross Unrealized, Loss	0	(1)
Fair Value	70,301	31,699
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	129,252	26,399
Gross Unrealized, Gain	464	0
Gross Unrealized, Loss	(10)	(10)
Fair Value	129,706	$ 26,389
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,364
Gross Unrealized, Gain	76
Gross Unrealized, Loss	0
Fair Value	$ 27,440

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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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