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Share-Based Compensation - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 11, 2024 | Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023 | Jun. 06, 2023 | Jan. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares outstanding |  | 421,699 | 523,349 | 547,199 |  | 598,043
Annual compensation amount |  | $ 1,378,000 | $ 1,347,000 | $ 1,290,000 |  |
Number of options granted |  | 0 | 0 | 0 |  |
Aggregate intrinsic value of options exercised |  | $ 242,000 | $ 32,000 | $ 200,000 |  |
Reservation of shares under Stock Purchase Plan |  | 40,000 |  |  |  |
Restricted Stock or Unit Expense |  | $ 1,338,000 | $ 1,322,000 | $ 1,271,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employee Stock Purchase Plan discount rate |  | 15.00% |  |  |  |
2007 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares outstanding |  | 178,599 |  |  |  |
2018 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares outstanding |  | 130,500 |  |  |  |
Shares available for grant under the Plan |  |  |  |  | 600,000 |
2018 Equity Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant under the Plan |  |  |  |  | 950,000 |
2018 Equity Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant under the Plan |  |  |  |  | 1,550,000 |
2022 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares purchase under Employee Stock Purchase Plan |  | 12,550 | 9,897 |  |  |
Shares available for grant under the Plan |  | 12,508 |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to options |  | $ 0 |  |  |  |
Aggregate intrinsic value of option exercised |  | $ 0 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense to be recognized, Weighted average period |  | 1 year 10 months 24 days |  |  |  |
Unrecognized compensation expense related to RSUs and RSAs |  | $ 1,400,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of unvested shares |  | 132,196 |  |  |  |
RSA [Member] | 2015 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares outstanding |  | 112,600 |  |  |  |
Performance Based RSUs [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of unvested shares |  | 121,581 |  |  |  |
Restricted Stock Award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of number of shares granted |  | 25.00% |  |  |  |
Annual compensation amount | $ 72,800 |  |  |  |  |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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