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Derivative Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
Dec. 31, 2013
Dec. 31, 2012
Assets    
Derivative asset (warrant)    $ 50,300
Liabilities    
Derivative liabilities 4,315,183 4,497,977
Level 1 [Member]
   
Assets    
Derivative asset (warrant)      
Liabilities    
Derivative liabilities      
Level 2 [Member]
   
Assets    
Derivative asset (warrant)    50,300
Liabilities    
Derivative liabilities 4,315,183 4,497,977
Level 3 [Member]
   
Assets    
Derivative asset (warrant)      
Liabilities    
Derivative liabilities