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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 184,317	$ 58,056
Gross Unrealized, Gain	759	43
Gross Unrealized, Loss	(4)	(11)
Fair Value	185,072	58,088
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,898	31,657
Gross Unrealized, Gain	80	43
Gross Unrealized, Loss	0	(1)
Fair Value	47,978	31,699
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	115,109	26,399
Gross Unrealized, Gain	612	0
Gross Unrealized, Loss	(4)	(10)
Fair Value	115,717	$ 26,389
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,310
Gross Unrealized, Gain	67
Gross Unrealized, Loss	0
Fair Value	$ 21,377

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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).

+ References

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