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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 30,415	$ 30,199
Gross Unrealized Gains	2	38
Gross Unrealized Losses	(859)	(171)
Fair Value	29,558	30,066
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,299	10,776
Gross Unrealized Gains	1	6
Gross Unrealized Losses	(206)	(35)
Fair Value	9,094	10,747
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,684	1,553
Gross Unrealized Gains		2
Gross Unrealized Losses	(37)	(4)
Fair Value	1,647	1,551
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	318	322
Gross Unrealized Gains		3
Gross Unrealized Losses	(11)	(3)
Fair Value	307	322
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,703	4,754
Gross Unrealized Gains	1	15
Gross Unrealized Losses	(142)	(33)
Fair Value	4,562	4,736
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,000	12,251
Gross Unrealized Gains		12
Gross Unrealized Losses	(446)	(92)
Fair Value	13,554	12,171
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	411	543
Gross Unrealized Losses	(17)	(4)
Fair Value	$ 394	$ 539

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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