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Closing Stock Price at Transaction Date and Inputs to Black-Scholes Option Pricing (Detail)
3 Months Ended
Apr. 30, 2013
Schedule Of Class Of Right Or Warrant Fair Value Assumption [Line Items]  
Exercise Price 0.40
Warrants
 
Schedule Of Class Of Right Or Warrant Fair Value Assumption [Line Items]  
Exercise Price 0.40
Expected Term (in years) 5 years
Volatility 36.70%
Dividend rate 0.00%
Interest rate 0.70%