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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | $ 4,931 | $ 21,974
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (182) | (171)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 3,168 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (245) |
Total Fair Value | 8,100 | 21,974
Total Unrealized Losses | (427) | (171)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 1,367 | 6,795
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (39) | (35)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 583 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (42) |
Total Fair Value | 1,950 | 6,795
Total Unrealized Losses | (81) | (35)
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value |  | 1,129
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses |  | (4)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 178 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (5) |
Total Fair Value | 180 | 1,129
Total Unrealized Losses | (5) | (4)
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 524 | 198
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (14) | (3)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 117 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (10) |
Total Fair Value | 641 | 198
Total Unrealized Losses | (24) | (3)
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 825 | 3,006
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (23) | (33)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 844 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (82) |
Total Fair Value | 1,668 | 3,006
Total Unrealized Losses | (105) | (33)
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 2,215 | 10,552
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (106) | (92)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 1,063 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (82) |
Total Fair Value | 3,278 | 10,552
Total Unrealized Losses | (188) | (92)
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value |  | 294
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses |  | (4)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 383 |
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (24) |
Total Fair Value | 383 | 294
Total Unrealized Losses | $ (24) | $ (4)

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