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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheets and Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 45,891	$ 44,666
Gross Unrealized Gains	296	457
Gross Unrealized Losses	(40)	(7)
Fair Value	46,147	45,116
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,176	11,762
Gross Unrealized Gains	68	123
Gross Unrealized Losses	(13)
Fair Value	14,231	11,885
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,600	2,854
Gross Unrealized Gains	25	30
Fair Value	2,625	2,884
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,772	6,634
Gross Unrealized Gains	42	74
Gross Unrealized Losses	(2)
Fair Value	5,812	6,708
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,775	11,536
Gross Unrealized Gains	92	114
Gross Unrealized Losses	(22)	(6)
Fair Value	11,845	11,644
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,704	9,763
Gross Unrealized Gains	66	112
Gross Unrealized Losses	(1)
Fair Value	9,769	9,875
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,331	1,334
Gross Unrealized Gains	3	4
Gross Unrealized Losses	(2)	(1)
Fair Value	1,332	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

X

- 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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