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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value $ 4,931 $ 21,974
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (182) (171)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 3,168  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (245)  
Total Fair Value 8,100 21,974
Total Unrealized Losses (427) (171)
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 1,367 6,795
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (39) (35)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 583  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (42)  
Total Fair Value 1,950 6,795
Total Unrealized Losses (81) (35)
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value   1,129
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses   (4)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 178  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (5)  
Total Fair Value 180 1,129
Total Unrealized Losses (5) (4)
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 524 198
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (14) (3)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 117  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (10)  
Total Fair Value 641 198
Total Unrealized Losses (24) (3)
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 825 3,006
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (23) (33)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 844  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (82)  
Total Fair Value 1,668 3,006
Total Unrealized Losses (105) (33)
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 2,215 10,552
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (106) (92)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,063  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (82)  
Total Fair Value 3,278 10,552
Total Unrealized Losses (188) (92)
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value   294
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses   (4)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 383  
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (24)  
Total Fair Value 383 294
Total Unrealized Losses $ (24) $ (4)