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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 205,947	$ 58,056
Gross Unrealized, Gain	118	43
Gross Unrealized, Loss	(47)	(11)
Fair Value	206,018	58,088
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	78,032	31,657
Gross Unrealized, Gain	46	43
Gross Unrealized, Loss	0	(1)
Fair Value	78,078	31,699
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,811	26,399
Gross Unrealized, Gain	68	0
Gross Unrealized, Loss	(46)	(10)
Fair Value	114,833	$ 26,389
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,104
Gross Unrealized, Gain	4
Gross Unrealized, Loss	(1)
Fair Value	$ 13,107

X

- 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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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount, before tax, of unrealized loss 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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+ References

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Amount of 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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