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Sales by geographic area (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017
Revenue, Major Customer [Line Items] |  |
Sales revenue | $ 50,196 | $ 22,983
United States |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 49,534 | 22,254
Canada |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 547 | 551
Mexico |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 39 | 78
All other |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | 76 | 100
Foreign countries, total |  |
Revenue, Major Customer [Line Items] |  |
Sales revenue | $ 662 | $ 729

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