Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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%
Domestic Country [Member]
Income Tax [Line Items]
Operating Loss carry forward	$ 168,000,000
Net operating loss used to offset taxable income	1,500,000
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Operating Loss carry forward	$ 178,000,000