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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Mar. 04, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Accumulated temporary impairment		$ 2,500			$ 2,500
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized gain (loss) on debt securities		$ 4,700	$ (3,000)	$ (800)	$ 843
eNeura Note [Member] | eNeura Inc [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Non-refundable fees paid	$ 300
Accrued interest on promissory note	8.00%
Maturity description of Promissory note					The eNeura Note will mature on March 4, 2019
Debt Instrument, Maturity Date					Mar. 04, 2019
eNeura Note [Member] | eNeura Inc [Member] | Convertible Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Principal amount of promissory note	$ 15,000

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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