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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	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 44,320	$ 44,666
Gross Unrealized Gains	190	457
Gross Unrealized Losses	(30)	(7)
Fair Value	44,480	45,116
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,954	11,762
Gross Unrealized Gains	53	123
Gross Unrealized Losses	(6)
Fair Value	15,001	11,885
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,523	2,854
Gross Unrealized Gains	15	30
Gross Unrealized Losses	(1)
Fair Value	2,537	2,884
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,983	6,634
Gross Unrealized Gains	20	74
Gross Unrealized Losses	(2)
Fair Value	4,001	6,708
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,004	11,536
Gross Unrealized Gains	50	114
Gross Unrealized Losses	(15)	(6)
Fair Value	11,039	11,644
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,777	9,763
Gross Unrealized Gains	51	112
Gross Unrealized Losses	(5)
Fair Value	10,823	9,875
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	546	1,334
Gross Unrealized Gains	1	4
Gross Unrealized Losses	(1)	(1)
Fair Value	546	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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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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