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Income Taxes - Summary of Expected Tax Expense (Benefit) Based on the U.S. Federal Statutory Rate is Reconciled with the Actual Tax Provision (Benefit) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
U. S. federal statutory rate $ (11,582,000) $ (10,449,000)
State taxes, net of federal benefit (199,000)  
Permanent differences    
Permanent differences- Non-cash loss on extinguishment of debt   9,122,000
Permanent differences- Change in fair value of derivative liabilities 9,477,000  
Permanent differences- Write off of net operating loss 3,591,000  
Permanent differences- Other permanent differences 12,000 62,000
Change in valuation allowance (1,645,000) 1,265,000
Other 346,000  
Income tax provision (benefit) $ 0 $ 0