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The Company and key events - Key events for the six-month period ended June 30, 2024 (Details) |  | 6 Months Ended
--- | --- | ---
Jun. 10, 2024 EUR (€) share € / shares | Jun. 30, 2024 EUR (€) € / shares | Jun. 30, 2023 EUR (€)
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | share | 106,844 |  |
Exercise and subscription of equity instruments | € |  | € 93,000 | € 348,000
Ordinary Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | share | 38,100 |  |
Par value per share (in EUR per share) | € / shares |  | € 0.05 |
Free Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Share issued, price per share (in EUR per share) | € / shares | € 2.45 |  |
Exercise Of Share Warrants | Ordinary Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | share | 68,744 |  |
Definitive Acquisition Of Free Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Par value per share (in EUR per share) | € / shares | € 0.05 |  |
Ordinary Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Par value per share (in EUR per share) | € / shares | € 0.05 |  |
Issued capital free of subscription |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) | share | 68,744 |  |
Share premium |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Exercise and subscription of equity instruments | € |  | € 88,003 | 333,000
Share premium | Free Shares |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Exercise and subscription of equity instruments | € | € 91,440 |  |
Agreement with Sanofi, 2016 |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Milestone payment received | € |  | € 4,000,000 | € 2,000,000

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