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Marketable Securities - Fair Value of Available for Sale Marketable Securities (Detail) - Level 2 [Member] - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Adjusted Cost	$ 34,686	$ 41,326
Available for sale securities, Unrealized Gains		7
Available for sale securities, Unrealized Losses	(101)	(5)
Available for sale securities, Fair Value	34,585	41,328
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Adjusted Cost	34,686	37,325
Available for sale securities, Unrealized Gains		7
Available for sale securities, Unrealized Losses	(101)	(5)
Available for sale securities, Fair Value	$ 34,585	37,327
Government-Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities, Adjusted Cost		4,001
Available for sale securities, Fair Value		$ 4,001

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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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