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Fair Value Measurement - Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Less change in fair value of warrants $ 427,589 $ 4,076,360 $ 1,068,626 $ 95,266  
Less repayments of principal     (3,730,168) $ (2,996,204)  
Warrant Liabilities [Member]          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Balance at June 30, 2015 1,043,514        
Less change in fair value of warrants (427,589)        
Balance at September 30, 2015 615,925   615,925    
Balance at September 30, 2015 1,043,514   615,925   $ 615,925
Loan Payable Net of Discounts [Member]          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Balance at June 30, 2015 12,383,018        
Add amortization of discount 19,188        
Less repayments of principal (1,032,114)        
Balance at September 30, 2015 11,370,092   11,370,092    
Current portion         2,453,451
Non-current portion         8,916,641
Balance at September 30, 2015 $ 12,383,018   $ 11,370,092   $ 11,370,092