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Share capital - Free Share Plans (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 27, 2023 shares € / shares | Mar. 11, 2022 EUR (€) shares | Dec. 31, 2024 EUR (€) shares € / shares | Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 |  |
Par value per share (euro per share) | € / shares |  |  | € 0.03 | € 0.03 |
Capital increase | € |  |  | € 0 | € 61,641,000 | € 0
AGA 2023 - P1 |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) | 427,110 |  | 0 | 427,110 |
Number of warrants (BSAs) exercised (in shares) |  |  | 0 | 0 |
AGA 2023 - P2 |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) | 439,210 |  | 0 | 439,210 |
Number of warrants (BSAs) exercised (in shares) |  |  | 0 | 0 |
AGA 2023 |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) |  | 293,523 |  |  |
Vesting requirements for share-based payment arrangement, holding period |  | 1 year |  |  |
Vesting requirements for share-based payment arrangement, acquisition period |  | 2 years |  |  |
Capital increase | € |  | € 8,805.69 |  |  |
AGA |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 | 866,320 |
Maximum term of options granted for share-based payment arrangement in the event of death or disability of optionee |  | 6 months |  |  |
Number of warrants (BSAs) exercised (in shares) |  |  | 293,523 | 354,510 |
BSA |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) |  |  | 0 | 0 |
Number of warrants (BSAs) exercised (in shares) |  |  | 0 | 0 |
BSA | Kepler Cheuvreux subscription agreement |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of warrants (BSAs) exercised (in shares) |  |  | 0 |  |
Executive Board and Employees | AGA 2023 - P1 |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) | 427,110 |  |  |  |
Par value per share (euro per share) | € / shares | € 0.03 |  |  |  |
Vesting requirements for share-based payment arrangement, holding period | 1 year |  |  |  |
Vesting requirements for share-based payment arrangement, acquisition period | 2 years |  |  |  |
Executive Board and Employees | AGA 2023 - P2 |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares issued (in shares) | 439,210 |  |  |  |
Par value per share (euro per share) | € / shares | € 0.03 |  |  |  |
Vesting requirements for share-based payment arrangement, holding period | 1 year |  |  |  |
Vesting requirements for share-based payment arrangement, acquisition period | 2 years |  |  |  |

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