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Income Taxes (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)	0.00%	12.50%
Discrete income tax expense (benefit)		$ 0
Income tax expense (benefit)	$ 0	(1,000,000)
Pre-tax net loss	$ 10,000,000	$ 8,000,000
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Effective tax rate (percentage)			18.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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