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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. Federal income tax rate (34.00%) (34.00%) (34.00%)
Net deferred tax asset, valuation allowance $ 10,106,000 $ 8,140,000  
Cumulative pre-tax loss position period   3 years  
Federal net operating loss $ 7,000,000    
Federal net operating loss expiration beginning period 2034    
Uncertain Tax Positions $ 0 $ 0 $ 0
Current year tax provision 0 (137,000) (1,717,000)
Income tax (benefit) expense $ (762,000) $ 4,726,000 $ (2,201,000)