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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% |  |

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