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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 22,352 | $ 31,042
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 7 | 12
Fair Value, Less than 12 Months | 6,323 | 18,319
Unrealized Losses, Less than 12 Months | (6) | (157)
Fair Value, 12 Months or More | 12,734 | 11,845
Unrealized Losses, 12 Months or More | (216) | (49)
Fair Value | 19,057 | 30,164
Unrealized Losses | (222) | (206)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (222) | (206)
Available-for-sale Securities | 22,137 | 30,848
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 | 21,729 | 29,970
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 7 | 0
Fair Value, Less than 12 Months | 5,866 | 17,919
Unrealized Losses, Less than 12 Months | (6) | (157)
Fair Value, 12 Months or More | 12,634 | 11,845
Unrealized Losses, 12 Months or More | (216) | (49)
Fair Value | 18,500 | 29,764
Unrealized Losses | (222) | (206)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (222) | (206)
Available-for-sale Securities | 21,514 | 29,764
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 623 | 1,072
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 12
Fair Value, Less than 12 Months | 457 | 400
Unrealized Losses, Less than 12 Months | 0 | 0
Fair Value, 12 Months or More | 100 | 0
Unrealized Losses, 12 Months or More | 0 | 0
Fair Value | 557 | 400
Unrealized Losses | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities | $ 623 | $ 1,084

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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=82897076&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=82897076&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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