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Investments - Summary of Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 999 | $ 6,323
Unrealized Losses, Less than 12 Months | (1) | (6)
Fair Value, 12 Months or More | 4,820 | 12,734
Unrealized Losses, 12 Months or More | (16) | (216)
Fair Value | 5,819 | 19,057
Unrealized Losses | (17) | (222)
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 999 | 5,866
Unrealized Losses, Less than 12 Months | (1) | (6)
Fair Value, 12 Months or More | 4,820 | 12,634
Unrealized Losses, 12 Months or More | (16) | (216)
Fair Value | 5,819 | 18,500
Unrealized Losses | $ (17) | (222)
Corporate debt |  |
Debt Securities, Available-for-sale [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

X
- 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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X
- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months 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 No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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