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Share capital - Capital Issued (Details) - EUR (€) |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2024 | Dec. 13, 2023 | Nov. 10, 2023 | Nov. 07, 2023 | Sep. 11, 2023 | Apr. 20, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 21, 2024 | Apr. 19, 2023 | Dec. 31, 2021
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  | € (65,704,000) | € (1,843,000) | € (27,045,000) |  |  | € 26,790,000
Par value per share (euro per share) |  |  |  |  |  |  | € 0.03 | € 0.03 |  |  |  |
Net losses |  |  |  |  |  |  | € 68,132,000 | € 39,700,000 | 57,041,000 |  |  |
Janssen |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Adjustments for fair value losses |  |  |  |  |  |  |  | 4,200,000 |  |  |  |
Share Capital |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1,422,805.53 |  |  |  |  | € 1,056,911.46 | € 1,422,805.53 | € 1,413,999.85 | € 1,046,000 | € 1,413,999.85 | € 1,046,276.16 | € 1,045,000
Number of shares outstanding (in shares) |  |  |  |  |  |  | 47,426,851 | 47,133,328 | 34,875,872 |  |  | 34,825,872
Par value per share (euro per share) |  |  |  | € 0.03 |  |  |  |  |  |  |  |
Increase (decrease) in equity | € 8,805.69 | € 27,037.68 | € 112,887.69 | € 188,373.9 | € 28,789.11 | € 10,635.3 |  |  |  |  |  |
Increase (decrease) in number of shares outstanding |  |  |  | 6,279,130 |  |  |  |  |  |  |  |
Capital increase, net (in shares) |  |  |  |  |  |  | 293,523 | 12,257,456 | 50,000 |  |  |
Share Capital | ADS Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Capital increase, net (in shares) |  |  |  | 3,786,907 |  |  |  |  |  |  |  |
Share Capital | Janssen |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (euro per share) |  |  | € 0.03 |  | € 0.03 |  |  |  |  |  |  |
Capital increase, net (in shares) |  |  | 3,762,923 |  | 959,637 |  |  |  |  |  |  |
Share Capital | Janssen | ADS Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (euro per share) |  | € 0.03 |  |  |  |  |  |  |  |  |  |
Capital increase, net (in shares) |  | 901,256 |  |  |  |  |  |  |  |  |  |
Share Capital | AGA 2021 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (euro per share) |  |  |  |  |  | € 0.03 |  |  |  |  |  |
Capital increase, net (in shares) |  |  |  |  |  | 354,510 |  |  |  |  |  |
Share Capital | AGA 2022 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (euro per share) | € 0.03 |  |  |  |  |  |  |  |  |  |  |
Capital increase, net (in shares) | 293,523 |  |  |  |  |  |  |  |  |  |  |

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