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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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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