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Fair Value Measurements and Investments - Schedule of Reconciliation of Debt Security and Warrant (Detail) - eNeura Inc [Member] - Debt Security and Warrant [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 17,820	$ 16,050
Gains or losses recorded for the period
Recognized in other comprehensive income (loss)	(2,593)	3,200
Change in classification of debt security to held to maturity	(15,227)	0
Issuance of Warrant as consideration for extension	491	0
Impairment of Warrant	(491)	0
Ending balance	$ 0	$ 19,250

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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