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Discontinued operations - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Royalty revenue $ 174 $ 57
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 116 (58)
Inventory Write-down 0 168
RF Neulink [Member] | Radio Mobile, Inc [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Royalty revenue 174 57
Bioconnect division [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 10 $ (148)
Inventory Write-down $ 148