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Marketable Securities - Schedule of Fair Value Marketable Securities By Type of Security (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Amortized Cost	$ 15,079	$ 57,650	$ 101,027
Unrealized Gains	32	49	4
Unrealized Losses			(45)
Fair Value	15,111	57,699	100,986
U.S. Government Agency Treasuries and Securities
Marketable Securities [Line Items]
Amortized Cost	15,079	57,650	101,027
Unrealized Gains	32	49	4
Unrealized Losses			(45)
Fair Value	$ 15,111	$ 57,699	$ 100,986

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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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