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Investments - Debt Securities and Other Investments, Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 37,528	$ 41,042
Gross Unrealized Gains	153	27
Gross Unrealized Losses	(21)	(270)
Fair Value	37,660	40,799
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,304	20,777
Gross Unrealized Gains	80	19
Gross Unrealized Losses		(112)
Fair Value	9,384	20,684
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	930	1,339
Gross Unrealized Losses		(26)
Fair Value	930	1,313
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,867	5,230
Gross Unrealized Gains	26	5
Gross Unrealized Losses	(3)	(14)
Fair Value	6,890	5,221
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,944	3,833
Gross Unrealized Gains	26	2
Gross Unrealized Losses	(8)	(44)
Fair Value	6,962	3,791
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,311	9,271
Gross Unrealized Gains	21	1
Gross Unrealized Losses	(9)	(66)
Fair Value	12,323	9,206
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	800
Fair Value	800
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	372	592
Gross Unrealized Losses	(1)	(8)
Fair Value	$ 371	$ 584

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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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