Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	$ 17,190,000	$ 830,000
Derivative liability non-current	296,194	81,716
Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	12,400,000	610,000	0
Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	4,790,000	220,000	0
Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	296,194	81,716	487,555
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	17,190,000	830,000
Derivative liability non-current	17,486,194	911,716
Fair Value, Measurements, Recurring | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	12,400,000	610,000
Fair Value, Measurements, Recurring | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	4,790,000	220,000
Fair Value, Measurements, Recurring | Placement Agent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	296,194	81,716
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Derivative liability non-current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Placement Agent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Derivative liability non-current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Placement Agent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	17,190,000	830,000
Derivative liability non-current	17,486,194	911,716
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	12,400,000	610,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	4,790,000	220,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Placement Agent
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	$ 296,194	$ 81,716