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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Income tax expense (benefit)	$ 12,000	$ 38,000
Effective tax rate	0.24%	0.91%
Corporate federal income tax rate	21.00%	35.00%
Decrease in net deferred tax assets	$ 20,000,000
Federal and state Net Operating Losses	$ 147,000,000
Year of expiration of net operating loss carryforward expiration year	2027
Specified time period for ownership change	3 years
Accruals related to uncertainties tax positions	$ 0	$ 0
Tax year remain subject to examination	2015 2016 2017
Minimum [Member]
Income Tax Examination [Line Items]
Percentage of ownership change	50.00%
Percentage of change in ownership of shareholders	1.00%
Maximum [Member]
Income Tax Examination [Line Items]
Percentage of change in ownership of shareholders	5.00%

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