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Amount of Shares of Common Stock Reserved (Detail)
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Stock Option Outstanding [Line Items]      
Common stock issued and outstanding 46,952,469    
Warrants outstanding 3,145,000 2,936,000 1,500,000
Stock options outstanding 7,358,000 5,300,000 1,150,000
Remaining shares issuable under 2013 Equity Incentive Plan 1,820,000    
Common stock reserved for future issuance 68,207,549    
Subsequent Event
      
Stock Option Outstanding [Line Items]      
Common stock issued and outstanding 6,000,000 [1]    
Conversion of 8% Notes
      
Stock Option Outstanding [Line Items]      
Conversion of Notes 182,080 [2]    
Conversion of 9% Notes
      
Stock Option Outstanding [Line Items]      
Conversion of Notes 2,750,000    
[1] Reflects 2,000,000 shares and 4,000,000 warrants issued in March 2014 in connection with an equity investment. See Note 10.
[2] Reflects shares issued in February 2014 in connection with the conversion of the 8% notes. See Note 10.