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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 31,042 | $ 28,638
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 12 | 24
Fair Value, Less than 12 Months | 18,319 | 15,664
Unrealized Losses, Less than 12 Months | (157) | (60)
Fair Value, 12 Months or More | 11,845 | 0
Unrealized Losses, 12 Months or More | (49) | 0
Fair Value | 30,164 | 15,664
Unrealized Losses | (206) | (60)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (206) | (60)
Available-for-sale Securities | 30,848 | 28,602
U.S. Treasury securities, obligations of U.S. Government agencies and Municipals |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 29,970 | 26,280
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 11
Fair Value, Less than 12 Months | 17,919 | 14,663
Unrealized Losses, Less than 12 Months | (157) | (59)
Fair Value, 12 Months or More | 11,845 | 0
Unrealized Losses, 12 Months or More | (49) | 0
Fair Value | 29,764 | 14,663
Unrealized Losses | (206) | (59)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (206) | (59)
Available-for-sale Securities | 29,764 | 26,232
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,072 | 2,358
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 12 | 13
Fair Value, Less than 12 Months | 400 | 1,001
Unrealized Losses, Less than 12 Months | 0 | (1)
Fair Value, 12 Months or More | 0 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 400 | 1,001
Unrealized Losses | 0 | (1)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (1)
Available-for-sale Securities | $ 1,084 | $ 2,370

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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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