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Sales by geographic area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Revenue, Major Customer [Line Items]
Sales revenue	$ 22,380	$ 7,640	$ 32,721	$ 14,257
United States
Revenue, Major Customer [Line Items]
Sales revenue	22,242	7,418	32,387	13,954
Canada
Revenue, Major Customer [Line Items]
Sales revenue	124	130	277	176
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	0	70	39	77
All other
Revenue, Major Customer [Line Items]
Sales revenue	14	22	18	50
Foreign countries, total
Revenue, Major Customer [Line Items]
Sales revenue	$ 138	$ 222	$ 334	$ 303

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- Definition

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+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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