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Sales by geographic area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenue, Major Customer [Line Items]
Sales revenue	$ 13,850	$ 7,808	$ 46,571	$ 22,065
United States
Revenue, Major Customer [Line Items]
Sales revenue	13,682	7,603	46,069	21,557
Canada
Revenue, Major Customer [Line Items]
Sales revenue	142	180	419	356
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	0	0	40	77
All other
Revenue, Major Customer [Line Items]
Sales revenue	26	25	43	75
Foreign countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 168	$ 205	$ 502	$ 508

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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