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Stock Option Plans - Additional Information (Detail) | 12 Months Ended
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Jan. 31, 2020 USD ($) plan $ / shares shares | Jan. 31, 2019 USD ($) $ / shares shares | Jan. 31, 2018 USD ($) $ / shares shares
Stock Based Compensation [Line Items] |  |  |
Compensation expense related to stock-based awards granted | $ 854,000 | $ 781,000 | $ 903,000
Weighted average grant-date fair value of options granted | $ / shares | $ 1.77 | $ 1.80 | $ 2.02
Excess tax benefit from share-based compensation | $ 0 | $ 0 | $ 0
Number of plans with share-based awards outstanding | plan | 5 |  |
Intrinsic value of options exercised | $ 0 |  |
Number of options exercised | shares | 9,000 | 0 | 0
Fair value of options vested | $ 650,000 | $ 850,000 | $ 500,000
Options vested | shares | 335,000 |  |
Total unrecognized compensation expense related to unvested stock options | $ 1,000,000 |  |
Expense expected to be recognized over weighted average period | 1 year 7 months 6 days |  |
Restricted Stock |  |  |
Stock Based Compensation [Line Items] |  |  |
Total unrecognized compensation expense related to unvested restricted stock awards | $ 0 |  |
2006 Plan |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock options granted and outstanding | 3 years |  |
Contractual term of stock options granted and outstanding | 10 years |  |
Shares available for grant | shares | 1,050,000 |  |
1994 Plan |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock options granted and outstanding | 3 years |  |
Contractual term of stock options granted and outstanding | 10 years |  |
1998 Plan |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock options granted and outstanding | 3 years |  |
Contractual term of stock options granted and outstanding | 10 years |  |
2000 Plan |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock options granted and outstanding | 3 years |  |
Contractual term of stock options granted and outstanding | 10 years |  |
Director Plan |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock options granted and outstanding | 1 year |  |
Contractual term of stock options granted and outstanding | 10 years |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(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 option under share-based payment arrangement. + 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 cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118258462&loc=d3e11374-113907 + 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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