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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
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,541 $ 9,671
Gross Unrealized Gains 11 9
Gross Unrealized Losses (339) (427)
Fair Value 9,213 9,253
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,218 2,538
Gross Unrealized Gains 4 5
Gross Unrealized Losses (63) (81)
Fair Value 2,159 2,462
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 185 185
Gross Unrealized Losses (4) (5)
Fair Value 181 180
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 734 818
Gross Unrealized Gains 1 1
Gross Unrealized Losses (20) (24)
Fair Value 715 795
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,699 1,853
Gross Unrealized Gains 1  
Gross Unrealized Losses (82) (105)
Fair Value 1,618 1,748
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,299 3,870
Gross Unrealized Gains 5 3
Gross Unrealized Losses (151) (188)
Fair Value 4,153 3,685
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 406 407
Gross Unrealized Losses (19) (24)
Fair Value $ 387 $ 383