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Intangible assets (Detail) - USD ($) $ in Thousands | Oct. 31, 2018 | Oct. 31, 2017
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Intangible Assets [Line Items] |  |
Amortizable intangible assets, net | $ 1,367 | $ 1,642
Non-amortizable intangible assets, trade marks | 657 | 657
Customer relationships (estimated lives 7 - 15 years) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 2,879 | 2,879
Amortizable intangible assets, accumulated amortization | (1,619) | (1,354)
Amortizable intangible assets, net | 1,260 | 1,525
Patents (estimated life 14 years) |  |
Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 142 | 142
Amortizable intangible assets, accumulated amortization | (35) | (25)
Amortizable intangible assets, net | $ 107 | $ 117

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