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Shareholders’ equity - Change in share capital (Details) € / shares in Units, € in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended | 130 Months Ended |  |
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Oct. 24, 2023 € / shares shares | May 24, 2023 EUR (€) € / shares shares | Feb. 22, 2023 EUR (€) € / shares shares | Sep. 07, 2022 EUR (€) € / shares shares | Mar. 31, 2024 shares | Oct. 31, 2020 shares | Dec. 31, 2024 EUR (€) shares € / shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2022 EUR (€) € / shares shares | Dec. 31, 2024 shares € / shares | Nov. 19, 2024 € / shares | Oct. 24, 2023 $ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity | € |  |  | € 130,000 | € 46,231 |  |  |  | € 353,377 | € 46,231 |  |  |
Capital increase from issuance of ordinary shares (in shares) | 20,325,500 |  | 20,000,000 | 5,530,000 |  |  |  | 40,325,500 | 5,530,000 |  |  |
Par value per share (in euro per share) | € / shares | € 0.01 | € 0.01 | € 0.01 | € 0.01 |  |  | € 0.01 | € 0.01 | € 0.01 | € 0.01 | € 0.01 |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  | € 6.50 | € 8.36 |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  |  | 522 |  |  |
Exercises of share warrants | € |  | € 1,850 |  |  |  |  | € 45 |  | € 3 |  |  |
Exercises of share warrants (in shares) |  |  |  |  |  | 464,309 | 4,000 |  | 19,134 |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  | € 0.14 |  |  |
Share issue related cost | € |  |  |  |  |  |  |  | € 28,111 | € 3,280 |  |  |
Transaction costs related to capital increase | € |  |  |  |  |  |  | € 446 | (28,111) | € (3,280) |  |  |
Issue of free shares (in shares) |  |  |  |  |  |  | 415,019 |  |  |  |  |
ADS |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | 18,699,460 |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 11.60
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | 1,626,040 |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | € / shares | € 10.9864 |  |  |  |  |  |  |  |  |  |  |
Kreos share warrants |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants | € |  | € 1,850 |  |  |  |  |  | € 1,850 |  |  |  |
Exercises of share warrants (in shares) |  | 99,583 |  |  |  |  |  | 99,583 |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  | € 18.57 |  |  |  |  |  |  |  |  |  |
Other equity agreement |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  | 4,000 | 1,906 |  |  |  |
Exercises of share warrants | € |  |  |  |  |  |  |  | € 2 |  |  |  |
Exercises of share warrants (in shares) |  |  |  |  |  |  | 4,000 | 190,550 |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  | € 11.14 | € 0.01 |  | € 11.14 |  |
Kreos A BSA | Kreos share warrants |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  | 67,887 |  |  |  |  |  |  |  |  |  |
Kreos B BSA | Kreos share warrants |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  | 31,696 |  |  |  |  |  |  |  |  |  |
BSAs |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  | 324,446 |  |
BSA-2024-1 and BSA-2024-2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  | 77,820 |  |  |  |  |  |  |
Share warrants, subscription price (in euro per share) | € / shares |  |  |  |  |  |  | € 2.57 |  |  | € 2.57 |  |

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