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Notes to the interim condensed consolidated statement of financial position - Shareholders' equity - Options and share warrants (BSA and BSPCE) (Details) - € / shares | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
BSA share warrants | Directors |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Subscription price per share |  |  |  |  |  | € 0.534
BSA share warrants | Service providers |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Subscription price per share |  |  |  |  | € 0.48 |
BSA share warrants | David Nikodem |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Subscription price per share |  | € 2.45 | € 0.29 | € 0.18 |  |
BSA 2023 plan | David Nikodem |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Subscription price per share | € 0.20 |  |  |  |  |
Exercise price | 2.51 |  |  |  |  |
BSA- 2 2023 plan | David Nikodem |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Subscription price per share | 0.31 |  |  |  |  |
Exercise price | € 3.91 |  |  |  |  |

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