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Fair Value Measurements and Marketable Debt Securities - Summary of Marketable Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 24,873	$ 43,015
Gross Unrealized Gains	36	35
Gross Unrealized Losses	(4)
Fair Value	24,905	43,050
Corporate Bonds (Due within 1 Year) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,590	14,628
Gross Unrealized Gains	3	20
Gross Unrealized Losses	(4)
Fair Value	8,589	14,648
Commercial Paper (Due within 1 Year) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,687	13,406
Fair Value	5,687	13,406
U.S. Government Securities (Due within 1 Year) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,596	14,981
Gross Unrealized Gains	33	15
Fair Value	$ 10,629	$ 14,996

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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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