Discontinued operations - Additional Information (Detail) (USD $)	3 Months Ended
	Jan. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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]
Royalty revenue	4,000
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%
RF Neulink
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Royalty revenue	4,000
Raveon | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Finite-Lived Intangible Assets, Gross	$ 450,000