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Fair Value Measurement - Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Add loan proceeds $ 13,820,264
Initial carrying value 13,332,688
Less repayments of principal (620,215)
Add accretion of discount 196,771
Outstanding warrants [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2012 9,157,397
Less fair value of warrants exercise (470,303)
Add change in fair value of warrants (3,145,285)
Balance at December 31, 2013 5,541,809
Loan Payable [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Add loan proceeds 13,820,264
Less discount (487,576)
Initial carrying value 13,332,688
Less repayments of principal (620,215)
Add accretion of discount 196,771
Balance at December 31, 2013 12,909,244
Current portion 3,664,370
Non-current portion $ 9,244,874