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Stock-based compensation - Stock option activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Jan. 31, 2022
Shares |  |  |
Outstanding at beginning of period (in shares) | 2,825,752 |  |
Outstanding at end period (in shares) | 2,825,752 |  | 2,825,752
Vested and exercisable (in shares) | 187,500 |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price Outstanding at beginning period (in dollars per share) | $ 10.76 |  |
Weighted Average Exercise Price Outstanding at end period (in dollars per share) | 10.76 |  | $ 10.76
Weighted Average Exercise Price Vested and Exercisable (in dollars per share) | $ 10.75 |  |
Weighted Average Remaining Contractual Term (Years) |  |  |
Weighted Average Remaining Contractual Term Outstanding (in Years) |  | 9 years 2 months 12 days | 9 years 4 months 24 days
Unrecognized equity-based compensation costs | $ 7.6 |  |
Cost expected to be recognized over a weighted-average period | 3 years 2 months 12 days |  |

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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