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Investments - Breakdown of Investments with Unrealized Losses (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value $ 4,931
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (182)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 3,170
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (245)
Total Fair Value 8,100
Total Unrealized Losses (427)
Corporate Bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 1,367
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (39)
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
Total Unrealized Losses (81)
Municipal Fixed-Rate Bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 0
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses 0
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 180
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (5)
Total Fair Value 180
Total Unrealized Losses (5)
Asset-Backed Bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 524
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (14)
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
Total Unrealized Losses (24)
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
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (23)
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
Total Unrealized Losses (105)
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
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (106)
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
Total Unrealized Losses (188)
Foreign Government Bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 0
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses 0
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
Total Unrealized Losses $ (24)