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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 - Fair Value, Inputs, Level 3 [Member] $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
Beginning balance | $ 17,820
Gains or losses recorded for the period |
Recognized in other comprehensive income (loss) | (2,593)
Change in classification of debt security to held to maturity | (15,227)
Issuance of Warrant as consideration for prior extension of debt maturity date | 491
Impairment of warrant | $ (491)

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