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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 58,056	$ 79,432
Gross Unrealized Gains	43	52
Gross Unrealized Losses	(11)	(30)
Fair Value	58,088	79,454
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	31,657	13,775
Gross Unrealized Gains	43	52
Gross Unrealized Losses	(1)	0
Fair Value	31,699	13,827
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	26,399	65,657
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	(30)
Fair Value	$ 26,389	$ 65,627

X

- Definition

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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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amortized cost 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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-Publisher FASB
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-Topic 320
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-Section 50
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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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