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Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | $ 7,700 | $ 8,100
Cost | 27,583 | 22,352
Gross Unrealized Gains | 205 | 7
Gross Unrealized Losses | (17) | (222)
Fair Value | 27,771 | 22,137
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 23,254 | 21,729
Gross Unrealized Gains | 164 | 7
Gross Unrealized Losses | (17) | (222)
Fair Value | 23,401 | 21,514
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 4,329 | 623
Gross Unrealized Gains | 41 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 4,370 | $ 623

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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