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Investments - Additional Information (Detail) - ENeura Restructured Debt Security [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Original effective interest rate of debt security	8.00%		8.00%
Restructured Note, amortized cost	$ 15,100,000		$ 15,100,000
Estimated fair value of debt securities	16,000,000.0		16,000,000.0
Unpaid principal balance of debt securities	15,000,000.0		15,000,000.0
Interest income	$ 200,000	$ 0	$ 300,000	$ 0

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Debt securities, held-to-maturity unpaid principal balance.

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

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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