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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 72,379	$ 79,432
Gross Unrealized, Gain	7	52
Gross Unrealized, Loss	(68)	(30)
Fair Value	72,318	79,454
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,322	13,775
Gross Unrealized, Gain	7	52
Gross Unrealized, Loss	(1)	0
Fair Value	26,328	13,827
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,057	65,657
Gross Unrealized, Gain	0	0
Gross Unrealized, Loss	(67)	(30)
Fair Value	$ 45,990	$ 65,627

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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-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).

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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).

+ References

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