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Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 95,166	$ 50,868
Gross Unrealized Gain	2
Gross Unrealized Loss	(283)	(97)
Fair Value	94,885	50,771
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,167	3,758
Fair Value	6,167	3,758
United States government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,971	11,252
Gross Unrealized Loss	(23)	(24)
Fair Value	15,948	11,228
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	73,028	35,858
Gross Unrealized Gain	2
Gross Unrealized Loss	(260)	(73)
Fair Value	$ 72,770	$ 35,785

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- 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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