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Income Taxes - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Valuation allowance $ 10,308,000 $ 9,108,000
Federal income tax net operating loss carry forward $ 17,100,000 $ 14,800,000
Net Operating Loss Carry Forwards Expiration Dates various dates beginning in 2031