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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	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 45,416	$ 44,666
Gross Unrealized Gains	139	457
Gross Unrealized Losses	(40)	(7)
Fair Value	45,515	45,116
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,381	11,762
Gross Unrealized Gains	39	123
Gross Unrealized Losses	(6)
Fair Value	13,414	11,885
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,236	2,854
Gross Unrealized Gains	13	30
Gross Unrealized Losses	(1)
Fair Value	2,248	2,884
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,497	6,634
Gross Unrealized Gains	17	74
Gross Unrealized Losses	(1)
Fair Value	3,513	6,708
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,194	11,536
Gross Unrealized Gains	35	114
Gross Unrealized Losses	(17)	(6)
Fair Value	9,212	11,644
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,031	9,763
Gross Unrealized Gains	34	112
Gross Unrealized Losses	(13)
Fair Value	16,052	9,875
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	544	1,334
Gross Unrealized Gains	1	4
Gross Unrealized Losses	(2)	(1)
Fair Value	543	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	533
Fair Value	$ 533	$ 533

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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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