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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 8,410 $ 9,671
Gross Unrealized Gains 1 9
Gross Unrealized Losses (337) (427)
Fair Value 8,074 9,253
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,897 2,538
Gross Unrealized Gains 1 5
Gross Unrealized Losses (58) (81)
Fair Value 1,840 2,462
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 185 185
Gross Unrealized Losses (2) (5)
Fair Value 183 180
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 670 818
Gross Unrealized Gains   1
Gross Unrealized Losses (22) (24)
Fair Value 648 795
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,298 1,853
Gross Unrealized Losses (74) (105)
Fair Value 1,224 1,748
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,955 3,870
Gross Unrealized Gains   3
Gross Unrealized Losses (162) (188)
Fair Value 3,793 3,685
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 405 407
Gross Unrealized Losses (19) (24)
Fair Value $ 386 $ 383