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Stock-based compensation and equity transactions - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended			9 Months Ended
	Dec. 13, 2017	Jul. 17, 2017	Jul. 31, 2018	Jan. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding						4 years 8 months 1 day
Weighted average remaining contractual life of options exercisable						3 years 3 months 29 days
Weighted average life of options vested and expected to vest						4 years 7 months 24 days
Aggregate intrinsic value of options outstanding			$ 6,612,000			$ 6,612,000
Aggregate intrinsic value of options exercisable			4,461,000			4,461,000
Aggregate intrinsic value of options vested and expected to vest			6,583,000			6,583,000
Non-vested stock-based arrangements yet to be recognized			305,000			$ 305,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized						6 years 7 days
Non-employee director annual grant				$ 50,000
Fair value of stock option per share				$ 0.659
Stock based compensation expense			$ 57,000		$ 62,000	$ 189,000	$ 161,000
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued				37,927
Share Based Goods And Non Employee Services Transaction Value Of Stock Option Issued				$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		9 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				5 years
Incentive stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	80,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	8,000	10,000
Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Period	10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	80,000	72,000
Employee And Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock option per share			$ 2.44		$ 1.60	$ 2.44	$ 1.60
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense						$ 0	$ 9,000
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense						$ 189,000	$ 152,000

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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