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Significant events for the years ended December 31, 2023, 2024 and 2025 and subsequent events - For the year ended 2023 (Details) € / shares in Units, $ / shares in Units, € in Thousands, $ in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 30 Months Ended | 145 Months Ended |  |  |
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Jul. 28, 2025 € / shares shares | Nov. 02, 2023 EUR (€) | Oct. 24, 2023 EUR (€) € / shares shares | Oct. 24, 2023 USD ($) shares | Aug. 24, 2023 EUR (€) | Aug. 22, 2023 EUR (€) | Aug. 21, 2023 EUR (€) | Aug. 20, 2023 EUR (€) transaction € / shares | May 24, 2023 € / shares shares | Feb. 22, 2023 EUR (€) € / shares shares | Jul. 30, 2021 EUR (€) € / shares shares | Oct. 31, 2020 shares | Dec. 31, 2023 shares plan € / shares | Dec. 31, 2025 EUR (€) shares € / shares | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2025 shares € / shares | Dec. 31, 2025 EUR (€) € / shares | Jul. 28, 2025 $ / shares | Nov. 19, 2024 € / shares | Oct. 24, 2023 $ / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  |  |  |  |  |  |  | € 130,000 |  |  |  | € 637,462 |  | € 353,377 |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  | 20,325,500 | 20,325,500 |  |  |  |  |  | 20,000,000 |  |  |  | 11,679,400 |  | 40,325,500 |  |  |  |  |
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 |  | € 0.01 |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  | € 6.50 |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 28,111 |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 464,309 |  |  | 4,000 |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 175,000 |  |  |
Repayments of convertible loan notes |  |  |  |  | € 33,000 |  |  |  |  |  |  |  |  | € 2,188 | € 8,750 | 27,188 |  |  |  |  |
Capital increases |  |  | € 223,300 | $ 235.8 |  |  |  |  |  |  |  |  |  | € 648,124 | € 0 | 353,377 |  | € 1,194,700 |  |  |
Capital increases |  |  | 202,000 | 212.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for share issue costs |  |  | € 21,300 | $ 23.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total AGAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share-based compensation plans issued | plan |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Number of instruments issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,601,296 | 6,280,727 |  |  | 10,828,148 |  |  |  |
ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares | 11,679,400 |  | 18,699,460 | 18,699,460 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received per ADS (in shares) | shares |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64.00 |  | $ 11.60
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  | 1,626,040 | 1,626,040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | € / shares | € 54.58 |  | € 10.9864 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos 1, convertible bond loans, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other share warrants repurchased (in shares) | shares |  |  |  |  |  |  |  |  | 43,070 |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  |  | 67,887 |  |  |  |  |  |  |  |  |  |  |  |
Kreos 1, convertible bond loans, tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other share warrants repurchased (in shares) | shares |  |  |  |  |  |  |  |  | 43,070 |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  |  | 31,696 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible loan notes |  |  |  |  | 8,000 |  | € 7,661 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  |  |  |  |  |  | € 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate exercise price |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of other share warrants |  | € 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate exercise price |  |  |  |  |  |  |  | € 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Heights convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  | € 14.4303 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  |  |  |  |  |  | € 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Heights convertible notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  | € 14.4303 |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret convertible notes (OCABSA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OCEANE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 1,964,031 |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  | € 30.55 |  |  |  |  |  |  |  |  |  |
Repayments of convertible loan notes |  |  |  |  | 25,102 |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |
Capital increases |  |  |  |  |  |  |  |  |  |  | € 60,000 |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing and Heights convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings, net of refinancing of existing indebteness |  |  |  |  | € 27,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 637,345 |  | € 352,974 |  |  |  |  |
€130.0 million cross-over financing, february 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial agreement, amount |  |  |  |  |  |  |  |  |  | € 130,000 |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  |  |  |  |  |  |  | € 130,000 |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Par value per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  | € 0.01 |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  | € 6.50 |  |  |  |  |  |  |  |  |  |  |
€130.0 million cross-over financing, february 2023 | Share premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  |  | € 6,700 |  |  |  |  |  |  |  |  |  |  |
€49.2 million cross-over financing, september 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, percentage of current share capital |  |  |  |  |  |  |  |  |  | 89.60% |  |  |  |  |  |  |  |  |  |  |
€150.0 million financing, august 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial agreement, amount |  |  |  |  |  |  |  | € 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Financial agreement, number of transactions | transaction |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |

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