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Derivative Liability - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative liability - warrants $ 26,493,000 $ 9,000
Total 26,493,000 9,000
Fair Value [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability - warrants 26,493,000  
Total 26,493,000  
Carrying Value [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability - warrants   9,000
Total   9,000
Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability - warrants 26,493,000 9,000
Total $ 26,493,000 $ 9,000