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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Examination [Line Items]
Income tax expense (benefit)		$ 38,000	$ 55,000
Effective tax rate		0.91%	0.82%
Corporate federal income tax rate		35.00%	35.00%
Decrease in net deferred tax assets		$ 20,000,000
Federal and state Net Operating Losses		$ 144,000,000
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
Scenario, Plan [Member]
Income Tax Examination [Line Items]
Corporate federal income tax rate	21.00%
Minimum [Member]
Income Tax Examination [Line Items]
Percentage of ownership change		50.00%
Percentage of change in ownership of shareholders		1.00%
Tax year remain subject to examination		2014
Maximum [Member]
Income Tax Examination [Line Items]
Percentage of change in ownership of shareholders		5.00%
Tax year remain subject to examination		2016

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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