Balances of Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 300,939	$ 605,516
Warrant liability	803,484	1,730,044
Total	1,104,423	2,335,560
QuotedPricesin ActiveMarketsfor IdenticalAssets (Level1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0	0
Warrant liability	0	0
Total	0	0
SignificantOther Observable Inputs (Level2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	0	0
Warrant liability	0	0
Total	0	0
Significant Unobservable Inputs (Level3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	300,939	605,516
Warrant liability	803,484	1,730,044
Total	$ 1,104,423	$ 2,335,560