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Financial liabilities - Kreos 1 (Details) € / shares in Units, € in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Dec. 23, 2025 EUR (€) | Aug. 28, 2025 EUR (€) | Jul. 30, 2025 EUR (€) | Aug. 24, 2023 EUR (€) | Aug. 21, 2023 EUR (€) | May 24, 2023 EUR (€) shares | Oct. 31, 2020 shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) | Jul. 24, 2018 EUR (€) tranche
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  | 464,309 |  | 4,000 |  |
Repayments of convertible loan notes | € |  |  |  | € 33,000 |  |  |  | € 2,188 | € 8,750 | € 27,188 |
Loss of extinguishment | € | € 3,838 |  |  |  |  |  |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants | € |  | € 11,531 | € 15,143 |  |  |  |  |  | € 45 |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) | shares |  |  |  |  |  |  |  | 1 |  |  |
Kreos A BSA |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  |  | 110,957 |  |  |
Exercise price, share options granted (in euro per share) | € / shares |  |  |  |  |  |  |  | € 7.21 |  |  |
Kreos B BSA |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  |  | 74,766 |  |  |
Exercise price, share options granted (in euro per share) | € / shares |  |  |  |  |  |  |  | € 10.70 |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Share warrants, subscription price (in euro per share) | € / shares |  |  |  |  |  |  |  | € 1 |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity | € |  |  |  |  |  |  |  |  |  |  | € 20,000
Borrowings, number of tranches | tranche |  |  |  |  |  |  |  |  |  |  | 2
Borrowings, maximum borrowing capacity per tranche | € |  |  |  |  |  |  |  |  |  |  | € 10,000
Kreos 1, non-convertible bond loans |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity | € |  |  |  |  |  |  |  |  |  |  | 16,000
Kreos 1, convertible bond loans |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity | € |  |  |  |  |  |  |  |  |  |  | € 4,000
Kreos 1, convertible bond loans, tranche B |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  | 31,696 |  |  |  |  |
Repayments of convertible loan notes | € |  |  |  | € 8,000 | € 7,661 |  |  |  |  |  |
Number of other share warrants repurchased (in shares) | shares |  |  |  |  |  | 43,070 |  |  |  |  |
Number of other share warrants converted (in shares) | shares |  |  |  |  |  | 31,696 |  |  |  |  |
Kreos 1 & 2 bond loans |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Loss of extinguishment | € |  |  |  |  | € 170 |  |  |  |  |  |
Kreos 1, convertible bond loans, tranche A |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  | 67,887 |  |  |  |  |
Number of other share warrants repurchased (in shares) | shares |  |  |  |  |  | 43,070 |  |  |  |  |
Number of other share warrants converted (in shares) | shares |  |  |  |  |  | 67,887 |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants | € |  |  |  |  |  | € 1,850 |  |  |  |  |

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