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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Add loan proceeds $ 1,955,279      
Less change in fair value of warrants (4,076,360) 143,511 (95,266) (425,570)
Less repayments of principal (970,830)   (970,830)  
Outstanding Warrants [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at December 31, 2013     5,541,809  
Less fair value of warrants exercised     (1,434,807)  
Less change in fair value of warrants     (95,266)  
Balance at September 30, 2014 4,011,736   4,011,736  
Balance 4,011,736   4,011,736  
Loan Payable [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at December 31, 2013     12,909,244  
Add loan proceeds     5,775,543  
Add amortization of discount     154,961  
Less repayments of principal (2,871,204)   (2,871,204)  
Balance at September 30, 2014 15,968,544   15,968,544  
Current portion 3,919,286   3,919,286  
Non-current portion 12,049,258   12,049,258  
Balance $ 15,968,544   $ 15,968,544