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Amount of Shares of Common Stock Reserved (Detail)
 9 Months Ended
Oct. 31, 2012
Jan. 31, 2012
Reconciliation of Common Stock Outstanding [Line Items]    
Common stock issued and outstanding 34,768,441  
Warrants 2,100,000 1,500,000
Stock options outstanding 5,225,000 1,150,000
Common stock reserved for future issuance 53,577,202  
10% Senior Subordinated Convertible Notes due January 31, 2016
    
Reconciliation of Common Stock Outstanding [Line Items]    
Conversion of Notes 10,883,761  
8% Senior Subordinated Convertible Notes due February 1, 2015
    
Reconciliation of Common Stock Outstanding [Line Items]    
Conversion of Notes 600,000