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Carrying Amounts and Fair Values of Financial Instruments (Detail) (Fair Value, Fair Value, Inputs, Level 3, USD $)
Jul. 31, 2012
Carrying Amounts and Fair Values of Financial Instruments [Line Items]  
Financial instrument $ 3,563,737 [1]
Derivative liability
 
Carrying Amounts and Fair Values of Financial Instruments [Line Items]  
Financial instrument 3,109,152 [1]
Warrant
 
Carrying Amounts and Fair Values of Financial Instruments [Line Items]  
Financial instrument $ 454,585 [1]
[1] No cost is associated with these liabilities (see Note 9)