Investments - Contractual Maturities of Debt Securities and Other Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale debt securities, Fair Value/Carrying Value	$ 9,213	$ 9,253
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than one year	369
One to two years	966
Two to three years	824
Available-for-sale debt securities, Fair Value/Carrying Value	2,159	2,462
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than one year	181
Available-for-sale debt securities, Fair Value/Carrying Value	181	180
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	169
Two to three years	49
Three to five years	337
More than ten years	160
Available-for-sale debt securities, Fair Value/Carrying Value	715	795
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	166
Two to three years	600
Three to five years	242
Five to ten years	238
More than ten years	372
Available-for-sale debt securities, Fair Value/Carrying Value	1,618	1,748
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than one year	508
One to two years	3,174
Two to three years	348
Three to five years	123
Available-for-sale debt securities, Fair Value/Carrying Value	4,153	3,685
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
One to two years	387
Available-for-sale debt securities, Fair Value/Carrying Value	$ 387	$ 383