Income Taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax [Line Items]
Federal statutory income tax rate		34.00%	34.00%	34.00%
Income tax expense		$ 0	$ 0	$ 0
Minimum percentage of likelihood of realization of deferred tax assets		50.00%
Change in valuation allowance		$ 24,070
Uncertain income tax position	$ 0	0
Domestic Country [Member]
Income Tax [Line Items]
Operating Loss carry forward	225,000,000	225,000,000
Net operating loss used to offset taxable income	$ 1,500,000	1,500,000
Domestic Country [Member] | Minimum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2020
Domestic Country [Member] | Maximum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2035
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Operating Loss carry forward	$ 258,000,000	$ 258,000,000
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2020
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax [Line Items]
Operating loss carry forward expiration term	Dec. 31, 2030