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Interest Expense on Convertible Notes (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Schedule Of Debt Instrument Interest Expense [Line Items]        
Amortization of debt discount     $ 70,777 $ 326,916
Convertible Notes Payable
        
Schedule Of Debt Instrument Interest Expense [Line Items]        
Interest expense 57,750 34,250 111,801 68,500
Amortization of loan fees 37,388 9,375 56,041 18,750
Amortization of debt discount 37,938 163,458 70,777 326,916
Interest expense, debt $ 133,076 $ 207,083 $ 238,620 $ 414,166