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Discontinued operations - Additional Information (Detail) - USD ($)
3 Months Ended
Jan. 31, 2018
Jan. 31, 2017
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 $ 0 $ 44,000
Radio Mobile, Inc [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Royalty revenue $ 0 62,000
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   $ 10,000