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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 0 | $ 6,323
Unrealized Losses, Less than 12 Months | 0 | (6)
Fair Value, 12 Months or More | 11,456 | 12,734
Unrealized Losses, 12 Months or More | (134) | (216)
Fair Value | 11,456 | 19,057
Unrealized Losses | (134) | (222)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 0 | 5,866
Unrealized Losses, Less than 12 Months | 0 | (6)
Fair Value, 12 Months or More | 11,456 | 12,634
Unrealized Losses, 12 Months or More | (134) | (216)
Fair Value | 11,456 | 18,500
Unrealized Losses | $ (134) | (222)
Corporate debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months |  | 457
Unrealized Losses, Less than 12 Months |  | 0
Fair Value, 12 Months or More |  | 100
Unrealized Losses, 12 Months or More |  | 0
Fair Value |  | 557
Unrealized Losses |  | $ 0

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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 of accumulated pre-tax unrealized loss on securities classified as available-for-sale recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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