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Discontinued operations - Additional Information (Detail) (USD $)
9 Months Ended 12 Months Ended
Jul. 31, 2013
Oct. 31, 2013
Oct. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Royalty revenue $ 450,000 $ 20,000  
Fair value of inventory   768,000  
Lease expiration date   Mar. 31, 2014  
Assets Sold Under Agreements To Repurchase Other Assets Costs     200,000
Radio Mobile, Inc
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets Sold under Agreements to Repurchase, Interest Rate     10.00%
Assets Sold Under Agreements To Repurchase Net Revenue     $ 2,000,000
Maximum
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Concentration Risk, Percentage 10.00%    
Minimum
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Concentration Risk, Percentage 5.00%