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Investments - Contractual Maturities of Debt Securities and Other Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, Fair Value/Carrying Value $ 8,074 $ 9,253
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 470  
One to two years 1,048  
Two to three years 322  
Available-for-sale debt securities, Fair Value/Carrying Value 1,840 2,462
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 183  
Available-for-sale debt securities, Fair Value/Carrying Value 183 180
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One to two years 218  
Three to five years 287  
More than ten years 143  
Available-for-sale debt securities, Fair Value/Carrying Value 648 795
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One to two years 164  
Two to three years 288  
Three to five years 226  
Five to ten years 200  
More than ten years 346  
Available-for-sale debt securities, Fair Value/Carrying Value 1,224 1,748
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 2,158  
One to two years 1,266  
Two to three years 249  
Three to five years 120  
Available-for-sale debt securities, Fair Value/Carrying Value 3,793 3,685
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than one year 278  
One to two years 108  
Available-for-sale debt securities, Fair Value/Carrying Value $ 386 $ 383