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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, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 42,007		$ 37,528
Gross Unrealized Gains	642		153
Gross Unrealized Losses	(17)		(21)
Fair Value	42,632	$ 37,700	37,660
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,747		9,304
Gross Unrealized Gains	168		80
Gross Unrealized Losses	(1)
Fair Value	13,914		9,384
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,379		930
Gross Unrealized Gains	21
Fair Value	2,400		930
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,600		6,867
Gross Unrealized Gains	86		26
Gross Unrealized Losses	(4)		(3)
Fair Value	7,682		6,890
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,944		6,944
Gross Unrealized Gains	152		26
Gross Unrealized Losses	(12)		(8)
Fair Value	8,084		6,962
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,935		12,311
Gross Unrealized Gains	211		21
Gross Unrealized Losses			(9)
Fair Value	8,146		12,323
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	540		372
Gross Unrealized Losses			(1)
Fair Value	540		371
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,120
Gross Unrealized Gains	4
Fair Value	1,124
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	300		800
Fair Value	300		$ 800
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	442
Fair Value	$ 442

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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