Stock-based compensation - Stock options (Details) - Stock Options |
3 Months Ended |
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Apr. 30, 2022 | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Vesting term | 4 years |
| Term of options | 10 years |
| Days following termination of employment or service | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expiration term | 90 days |
| Months following an optionees' death or disability | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expiration term | 12 months |
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- Definition Terms of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. No definition available.
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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