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Investments - Debt Securities and Other Investments, Included on Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,671 $ 30,199
Gross Unrealized Gains 9 38
Gross Unrealized Losses (427) (171)
Fair Value 9,253 30,066
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,538 10,776
Gross Unrealized Gains 5 6
Gross Unrealized Losses (81) (35)
Fair Value 2,462 10,747
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 185 1,553
Gross Unrealized Gains   2
Gross Unrealized Losses (5) (4)
Fair Value 180 1,551
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 818 322
Gross Unrealized Gains 1 3
Gross Unrealized Losses (24) (3)
Fair Value 795 322
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,853 4,754
Gross Unrealized Gains   15
Gross Unrealized Losses (105) (33)
Fair Value 1,748 4,736
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,870 12,251
Gross Unrealized Gains 3 12
Gross Unrealized Losses (188) (92)
Fair Value 3,685 12,171
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 407 543
Gross Unrealized Losses (24) (4)
Fair Value $ 383 $ 539