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Share-Based Compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 04, 2019 | Feb. 01, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Aug. 03, 2019 | Jul. 28, 2018 | Jun. 28, 2018 | Aug. 03, 2019 | Jul. 28, 2018 | Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  | 771,145 | 723,495 |  |  | 723,495 |  |
Options granted weighted-average fair value per share |  |  |  |  |  | $ 7.42 |  |  | $ 7.41 |
Reservation of shares under Stock Purchase Plan |  |  |  |  |  |  |  | 247,500 |  |
Restricted Stock or Unit Expense |  |  |  |  | $ 320,000 |  | $ 263,000 | $ 704,000 | $ 467,000 |
2015 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 27,527 |  |  | 27,527 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan discount rate |  |  |  |  |  |  |  | 15.00% |  |
Shares purchase under Employee Stock Purchase Plan |  |  |  |  |  |  |  | 2,796 | 2,342 |
Shares available for grant under the Plan |  |  |  |  | 31,057 |  |  | 31,057 |  |
2007 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 382,845 |  |  | 382,845 |  |
2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for grant under the Plan | 650,000 |  |  |  | 950,000 |  |  | 950,000 |  |
Number of shares outstanding |  |  |  |  | 146,000 |  |  | 146,000 |  |
Additional Shares Authorized Under the Plan | 300,000 |  |  |  |  |  |  |  |  |
Certain Key Employees [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 52,248 |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  | 0 |  |
Unrecognized compensation expense related to options |  |  |  |  | $ 1,100,000 |  |  | $ 1,100,000 |  |
Unrecognized compensation expense to be recognized, Weighted average period |  |  |  |  |  |  |  | 2 years |  |
2014 Restricted Stock Units (RSUs) [Member] | Certain Key Employees [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 45,374 |  |  |  |  |  |  |
RSA [Member] | 2015 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 194,650 |  |  | 194,650 |  |
RSA [Member] | 2007 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  | 1,007 |  |  | 1,007 |  |
RSA [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  | 163,475 |  |  |  |  |  |
RSA [Member] | Non-Employee Director [Member] | 2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  | 4,340 |  |  |  |  |  |  |  |
Restricted Stock Award [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted Stock or Unit Expense |  |  |  |  |  |  |  |  |  | $ 60,000
Restricted Stock Award [Member] | New Program [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  | 11,560 |  |
Restricted Stock Award And Restricted Stock Unit [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  | 113,522 |  |
Unrecognized compensation expense to be recognized, Weighted average period |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |
Unrecognized compensation expense related to RSUs and RSAs |  |  |  |  | $ 2,900,000 |  |  | $ 2,900,000 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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