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Significant events for the years ended December 31, 2023, 2024 and 2025 and subsequent events - For the year ended 2025 (Details) € / shares in Units, $ / shares in Units, € in Thousands, $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended | 110 Months Ended |  |  |  |  |
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Dec. 23, 2025 EUR (€) | Nov. 25, 2025 € / shares shares | Aug. 28, 2025 shares | Aug. 08, 2025 € / shares shares | Jul. 30, 2025 EUR (€) note € / shares shares | Jul. 30, 2025 EUR (€) note € / shares shares | Jul. 28, 2025 USD ($) shares | Jul. 28, 2025 EUR (€) € / shares shares | Mar. 20, 2025 shares | Feb. 06, 2025 shares | Apr. 30, 2025 shares | Mar. 31, 2025 shares | Jan. 31, 2025 shares | Sep. 30, 2024 plan | Nov. 30, 2025 shares plan | Dec. 31, 2025 shares | Dec. 31, 2023 | Dec. 31, 2025 shares | Jul. 28, 2025 $ / shares | Jul. 23, 2025 note | Jun. 30, 2025 € / shares | Oct. 24, 2023 € / shares | Oct. 24, 2023 $ / shares | Aug. 22, 2023 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of free shares plans issued | plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 8 |  |  |  |  |  |  |  |  |
Share price (euro per share) | € / shares |  |  |  |  |  |  |  | € 57.00 |  |  |  |  |  |  |  |  |  |  |  |  | € 6.64 |  |  |
Closing foreign exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1726 |  |  |  |
Proceeds from issue of ordinary shares |  |  |  |  |  |  | $ 747.5 | € 637,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issue of ordinary shares |  |  |  |  |  |  | $ 700.3 | 597,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuing other equity instruments | € |  |  |  |  |  |  |  | € 607,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  |  |  |  |  |  | 11,679,400 | 11,679,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | € / shares |  |  |  |  |  |  |  | € 54.58 |  |  |  |  |  |  |  |  |  |  |  |  |  | € 10.9864 |  |
Heights convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  |  |  |  | 920,377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of convertible notes converted | note |  |  |  |  | 200 | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |
Notional amount | € |  |  |  |  | € 21,900 | € 21,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  |  | € 23.7674 | € 23.7674 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret convertible notes (OCABSA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 21.2209
Kreos & Claret convertible notes (OCABSA) | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  | 392,695 |  | 785,389 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  | € 21.2209 |  | € 21.2209 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  |  | 206,662 |  |  | 319,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos/Claret financing B and C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € | € 29,985 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities | € | € 33,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total BSAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  |  | 39,370 |  | 125,000 |  |  | 164,370 |  | 486,714 |  |  |  |  |  |
Total BSAs | Tranche 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Total BSAs | Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Total BSAs | Board member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 25.00% |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
AGA-2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,280,727 |  |  |  |  |  |  |  |  |
AGA-2025 | Tranche 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
AGA-2025 | Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
AGA-2025 | Tranche 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
AGA-2025-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  | 123,102 |  |  |  |  | 123,102 | 123,102 |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
AGA-2025-5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  | 50,000 |  |  | 50,000 | 50,000 |  |  |  |  |  |  |  |
AGA-2025-1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  | 4,319,500 |  |  |  |  | 4,319,500 | 4,319,500 |  |  |  |  |  |  |  |

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