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Amount of Shares of Common Stock Reserved (Detail)
 6 Months Ended
Jul. 31, 2013
Jan. 31, 2013
Stock Option Outstanding [Line Items]    
Common stock issued and outstanding 35,918,441  
Warrants outstanding 3,145,000 2,936,000
Stock options outstanding 7,115,000 5,300,000
Remaining shares issuable under 2013 Equity Incentive Plan 2,530,000  
Conversion of Notes 62,475,082  
Conversion of 10% Notes
    
Stock Option Outstanding [Line Items]    
Common stock issued and outstanding 10,883,761  
Conversion of 8% Notes
    
Stock Option Outstanding [Line Items]    
Common stock issued and outstanding 600,000  
Conversion of 9% Notes
    
Stock Option Outstanding [Line Items]    
Common stock issued and outstanding 2,282,880