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Stock options - Additional Information (Detail) - USD ($)					1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 13, 2017	Sep. 08, 2017	Sep. 04, 2015	Sep. 05, 2014	Jul. 17, 2017	Jan. 31, 2018	Oct. 31, 2018	Mar. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding							4 years 6 months
Weighted average remaining contractual life of options exercisable							3 years 2 months 23 days
Weighted average life of options vested and expected to vest							4 years 5 months 26 days
Aggregate intrinsic value of options outstanding							$ 4,411,000
Aggregate intrinsic value of options exercisable							3,205,000
Aggregate intrinsic value of options vested and expected to vest							4,391,000
Non-vested stock-based arrangements yet to be recognized							$ 261,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized							6 years 7 months 20 days
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	80,000				100,000
Non-employee director annual grant							$ 50,000
Options granted for each non-employee director						37,927
Value of stock option issued							$ 25,000
Fair value of stock option							$ 0.659
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized								1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	8,000				10,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	8,000				10,000
Incentive stock options | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years				10 years
2010 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							1,524,588
Incentive and Non-Qualified Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional Shares Of Common Stock Issued		1,000,000	500,000	500,000

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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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