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Basis of Presentation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
Jun. 30, 2013
Dec. 31, 2012
Assets    
Derivative asset (warrant)   $ 50,300
Liabilities    
Derivative liabilities 3,030,140 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 3,030,140 4,497,977
Level 3 [Member]
   
Assets    
Derivative asset (warrant)      
Liabilities    
Derivative liabilities