Income Taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Statutory income tax rate		21.00%	(34.00%)	34.00%
Tax Cuts and Jobs Act, Accounting Complete		true
Tax Cuts and Jobs Act, Refundable tax credit percentage		50.00%
State income tax expense		$ 50,000
Minimum percentage of likelihood of realization of deferred tax assets		50.00%
Uncertain income tax positions	$ 0	$ 0
Domestic Country [Member]
Income Tax [Line Items]
Operating Loss carry forward	279,000,000	279,000,000
Net operating loss used to offset taxable income	1,500,000	1,500,000
Domestic Country [Member] | Indefinite [Member]
Income Tax [Line Items]
Operating Loss carry forward	$ 3,280,000	3,280,000
Domestic Country [Member] | Minimum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2024
Domestic Country [Member] | Maximum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2037
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Operating Loss carry forward	$ 264,000,000	$ 264,000,000
Operating loss carry forward expiration term		Dec. 31, 2030