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Summary of Fair Value of Notes Warrants (Detail) (USD $)
Jan. 31, 2013
Note warrant
 
Schedule Of Class Of Warrants Or Right Fair Value Disclosure [Line Items]  
Fair value of notes warrants $ 186,897
Placement agent warrants
 
Schedule Of Class Of Warrants Or Right Fair Value Disclosure [Line Items]  
Fair value of notes warrants $ 54,468