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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | $ 21,974 | $ 3,378
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (171) | (7)
Total Fair Value | 21,974 | 3,378
Total Unrealized Losses | (171) | (7)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 6,795 | 336
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (35) |
Total Fair Value | 6,795 | 336
Total Unrealized Losses | (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 | 310
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (4) |
Total Fair Value | 1,129 | 310
Total Unrealized Losses | (4) |
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 198 | 2
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (3) |
Total Fair Value | 198 | 2
Total Unrealized Losses | (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 | 3,006 | 2,078
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (33) | (6)
Total Fair Value | 3,006 | 2,078
Total Unrealized Losses | (33) | (6)
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 10,552 | 350
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (92) |
Total Fair Value | 10,552 | 350
Total Unrealized Losses | (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 | 302
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (4) | (1)
Total Fair Value | 294 | 302
Total Unrealized Losses | $ (4) | $ (1)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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