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Share capital - Stock Option Plans (Details) | Jul. 20, 2023 shares € / shares | Jun. 22, 2022 shares € / shares | Dec. 31, 2024 € / shares | Dec. 31, 2023 € / shares
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Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Par value per share (euro per share) |  |  | € 0.03 | € 0.03
OSA 2022-06 Ordinary |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Issued (in shares) | shares |  | 410,500 |  |
Exercise price (in euros per share) |  | € 4.16 |  |
Executive Board and Employees | Ordinary Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Issued (in shares) | shares | 1,224,780 |  |  |
Par value per share (euro per share) | € 0.03 |  |  |
Exercise price (in euros per share) | € 5.81 |  |  |
Maximum term of options granted for share-based payment arrangement | 10 years |  |  |
Executive Board and Employees | Ordinary Stock Options | Top of Range |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Maximum term of options granted for share-based payment arrangement | 10 years |  |  |
Executive Board and Employees | OSA 2022-06 Ordinary | Tranche one |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting requirements for share-based payment arrangement, vesting percentage |  | 33.33% |  |
Executive Board and Employees | OSA 2022-06 Ordinary | Tranche two |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting requirements for share-based payment arrangement, vesting percentage |  | 33.33% |  |
Executive Board and Employees | OSA 2022-06 Ordinary | Tranche three |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting requirements for share-based payment arrangement, vesting percentage |  | 33.33% |  |

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