Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	$ 1,330,000		$ 830,000
Derivative liability non-current	122,357		81,716
Fair value of derivative liability	1,452,357		911,716
Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	1,060,000	1,520,000	610,000	720,000	0	0
Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	270,000	540,000	220,000	300,000	0	0
Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	122,357	122,357	81,716	85,594	140,458	487,555
Derivative liability non-current	122,357		81,716
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	1,060,000		610,000
Fair Value, Inputs, Level 3 | Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	270,000		220,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability current	1,330,000		830,000
Fair value of derivative liability	1,452,357		911,716
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liability non-current	$ 122,357		$ 81,716