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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | $ 9,671,000
Gross Unrealized Gains |  | 9,000
Gross Unrealized Losses |  | (427,000)
Fair Value | $ 0 | 9,253,000
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 2,538,000
Gross Unrealized Gains |  | 5,000
Gross Unrealized Losses |  | (81,000)
Fair Value |  | 2,462,000
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 185,000
Gross Unrealized Losses |  | (5,000)
Fair Value |  | 180,000
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 818,000
Gross Unrealized Gains |  | 1,000
Gross Unrealized Losses |  | (24,000)
Fair Value |  | 795,000
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,853,000
Gross Unrealized Losses |  | (105,000)
Fair Value |  | 1,748,000
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 3,870,000
Gross Unrealized Gains |  | 3,000
Gross Unrealized Losses |  | (188,000)
Fair Value |  | 3,685,000
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 407,000
Gross Unrealized Losses |  | (24,000)
Fair Value |  | $ 383,000

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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