Fair value measurements (Details) - Fair Value, Recurring - USD ($) $ in Thousands |
Jul. 31, 2024 |
Jan. 31, 2024 |
|---|---|---|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Money market mutual funds | $ 68,165 | $ 58,942 |
| Total assets | 68,165 | 58,942 |
| Quoted Prices in Active Markets for Identical Assets (Level 1) | ||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Money market mutual funds | 68,165 | 58,942 |
| Total assets | 68,165 | 58,942 |
| Significant Other Observable Inputs (Level 2) | ||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Money market mutual funds | 0 | 0 |
| Total assets | 0 | 0 |
| Significant Unobservable Inputs (Level 3) | ||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||
| Money market mutual funds | 0 | 0 |
| Total assets | $ 0 | $ 0 |