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Stock Option Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Stock Based Compensation [Line Items] |  |  |  |  |  |
Compensation expense related to stock-based awards granted | $ 115,000 | $ 219,000 | $ 224,000 | $ 449,000 | $ 708,000 | $ 854,000
Weighted average grant-date fair value of options granted (in usd per share) |  |  |  |  | $ 0.70 | $ 1.77
Excess tax benefit from share-based compensation |  |  |  |  | $ 0 | $ 0
Vesting period of stock options granted and outstanding (in years) |  |  |  |  | 3 years |
Contractual term of stock options granted and outstanding (in years) |  |  |  |  | 10 years |
Shares available for grant (in shares) |  |  |  |  | 615,000 |
Options exercised (in shares) |  |  |  |  | 0 | 9,000
Intrinsic value of options exercised |  |  |  |  |  | $ 0
Fair value of options vested |  |  |  |  | $ 950,000 | $ 650,000
Options vested (in shares) |  |  |  |  | 500,000 |
Total unrecognized compensation expense related to unvested stock options |  |  |  |  | $ 482,228 |
Expense expected to be recognized over weighted average period (in years) |  |  |  |  | 1 year 3 months 18 days |
Restricted Stock |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Total unrecognized compensation expense related to unvested restricted stock awards |  |  |  |  | $ 0 |

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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=120381028&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=120381028&loc=d3e5070-113901 + Details
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