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Investments - Contractual Maturities of Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Fair Value/Carrying Value	$ 9,253	$ 30,066
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	1,450
Two to three years	1,012
Available-for-sale debt securities, Fair Value/Carrying Value	2,462	10,747
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than one year	180
Available-for-sale debt securities, Fair Value/Carrying Value	180	1,551
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	96
Two to three years	186
Three to five years	335
More than ten years	178
Available-for-sale debt securities, Fair Value/Carrying Value	795	322
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	162
Two to three years	598
Three to five years	253
Five to ten years	317
More than ten years	418
Available-for-sale debt securities, Fair Value/Carrying Value	1,748	4,736
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than one year	160
One to two years	2,787
Two to three years	617
Three to five years	121
Available-for-sale debt securities, Fair Value/Carrying Value	3,685	12,171
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	276
Two to three years	107
Available-for-sale debt securities, Fair Value/Carrying Value	$ 383	$ 539

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