Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability Current	$ 2,060,000		$ 830,000
Derivative Liability Non-current	122,357		81,716
Fair value of derivative liability	2,182,357		911,716
Conversion Options | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability Current	1,520,000	4,790,000	610,000	0		0
Warrant | 8% convertible promissory notes
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability Current	540,000	2,310,000	220,000	0		0
Placement Agent | Warrant
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability Current	122,357	216,016	81,716	140,458	244,997	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	1,520,000		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	540,000		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	2,060,000		830,000
Fair value of derivative liability	2,182,357		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