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Sales by geographic area (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | $ 7,640 | $ 8,315 | $ 22,159 | $ 22,223
United States |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | 7,441 | 7,989 | 21,536 | 21,242
Canada |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | 90 | 64 | 236 | 290
Israel |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | 1 | 76 | 63 | 264
Mexico |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | 85 | 135 | 234 | 324
All other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | 23 | 51 | 90 | 103
Foreign countries, total |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Sales revenue | $ 199 | $ 326 | $ 623 | $ 981

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