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Investments - Debt Securities and Other Investments, Included on Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 30,199	$ 44,666
Gross Unrealized Gains	38	457
Gross Unrealized Losses	(171)	(7)
Fair Value	30,066	45,116	$ 37,700
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,776	11,762
Gross Unrealized Gains	6	123
Gross Unrealized Losses	(35)
Fair Value	10,747	11,885
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,553	2,854
Gross Unrealized Gains	2	30
Gross Unrealized Losses	(4)
Fair Value	1,551	2,884
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	322	6,634
Gross Unrealized Gains	3	74
Gross Unrealized Losses	(3)
Fair Value	322	6,708
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,754	11,536
Gross Unrealized Gains	15	114
Gross Unrealized Losses	(33)	(6)
Fair Value	4,736	11,644
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,251	9,763
Gross Unrealized Gains	12	112
Gross Unrealized Losses	(92)
Fair Value	12,171	9,875
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	543	1,334
Gross Unrealized Gains		4
Gross Unrealized Losses	(4)	(1)
Fair Value	$ 539	1,337
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		250
Fair Value		250
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		533
Fair Value		$ 533

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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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