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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 42,519	$ 79,432
Gross Unrealized, Gain	2	52
Gross Unrealized, Loss	(30)	(30)
Fair Value	42,491	79,454
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,441	13,775
Gross Unrealized, Gain	0	52
Gross Unrealized, Loss	(6)	0
Fair Value	18,435	13,827
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,078	65,657
Gross Unrealized, Gain	2	0
Gross Unrealized, Loss	(24)	(30)
Fair Value	$ 24,056	$ 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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-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).

+ References

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