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Stock options - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Jun. 07, 2019 | Mar. 08, 2019 | Dec. 03, 2018 | Dec. 13, 2017 | Dec. 13, 2017 | Sep. 08, 2017 | Sep. 04, 2015 | Sep. 05, 2014 | Jan. 31, 2019 | Oct. 31, 2019 | Oct. 31, 2018 | Nov. 01, 2018 | Mar. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining life of options outstanding |  |  |  |  |  |  |  |  |  | 4 years 1 month 28 days |  |  |
Weighted average remaining contractual life of options exercisable |  |  |  |  |  |  |  |  |  | 2 years 7 months 13 days |  |  |
Weighted average life of options vested and expected to vest |  |  |  |  |  |  |  |  |  | 4 years 1 month 24 days |  |  |
Aggregate intrinsic value of options outstanding |  |  |  |  |  |  |  |  |  | $ 2,340,000 |  |  |
Aggregate intrinsic value of options exercisable |  |  |  |  |  |  |  |  |  | 1,735,000 |  |  |
Aggregate intrinsic value of options vested and expected to vest |  |  |  |  |  |  |  |  |  | 2,330,000 |  |  |
Non-vested stock-based arrangements yet to be recognized |  |  |  |  |  |  |  |  |  | $ 439,000 |  |  |
Stock based arrangements yet to be recognized, weighted average period expected to be recognized |  |  |  |  |  |  |  |  |  | 5 years 3 months |  |  |
Share-based compensation arrangement by share-based payment award, options, grants in period, gross |  |  |  |  |  |  |  |  | 7,203 |  |  |  |
Non-employee director annual grant |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |
Fair value of stock option per share |  |  |  |  |  |  |  |  |  | $ 3.471 |  |  |
Stock based compensation expense |  |  |  |  |  |  |  |  |  | $ 317,000 | $ 211,000 |  |
Share Based Goods And Non Employee Services Transaction Value Of Stock Option Issued |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000
Nonqualified Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of stock option per share | $ 3.245 |  |  |  |  |  |  |  |  |  |  |  |
Share Based Goods And Non Employee Services Transaction Value Of Stock Option Issued | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 7.50 |  |  |  |  |  |  |  | $ 8.07 |  |  |  |
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | 3,082 |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified Plan [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Payable Annually for Services Rendered |  |  |  |  |  |  |  |  |  |  |  | $ 15,000 |
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 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  |  | 8,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | 8,000 |  |  |  |  |  |  |  |  |
Incentive stock options | One Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 25,000 | 10,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  | 5,000 | 2,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years | 10 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  | 5,000 | 2,000 |  |  |  |  |  |  |  |  |  |
Incentive stock options | Two Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 25,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  | 5,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  | 5,000 |  |  |  |  |  |  |  |  |  |
Incentive stock options | Nonqualified Plan [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 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 1,405,741 |  |  |
Incentive and Non-Qualified Stock Option Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additiona shares of common stock issued |  |  |  |  |  | 1,000,000 | 500,000 | 500,000 |  |  |  |  |

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