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Financial liabilities - Kreos 1 (Details) € / shares in Units, € in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Aug. 24, 2023 EUR (€) € / shares | Aug. 21, 2023 EUR (€) | Aug. 20, 2023 EUR (€) € / shares | May 24, 2023 EUR (€) shares | Dec. 31, 2022 EUR (€) € / shares shares | Dec. 31, 2021 EUR (€) € / shares | Jul. 24, 2018 EUR (€) installment tranche € / shares shares | Oct. 31, 2020 EUR (€) shares | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2022 EUR (€) € / shares shares | Jun. 21, 2024 € / shares | Mar. 28, 2024 € / shares | Nov. 02, 2023 € / shares | Aug. 22, 2023 shares | Apr. 01, 2022 € / shares | Oct. 13, 2020 installment
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of convertible bond loans |  |  |  |  |  |  |  |  | € 0 | € 55,841 | € 0 |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  | 464,309 | 4,000 |  | 19,134 |  |  |  |  |  |
Borrowings, number of monthly installments | installment |  |  |  |  |  |  | 54 |  |  |  |  |  |  |  |  |  | 36
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 0.14 |  |  |  |  |  | € 0.14 |  |  |  |  |  |
Repayments of convertible loan notes | € 33,000 |  |  |  |  |  |  |  | € 8,750 | 27,188 | € 0 |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  | € 566 | € 9,932 |  |  | 4,786 | € 2,579 | 566 |  |  |  |  |  |
Exercises of share warrants |  |  |  | € 1,850 |  |  |  |  | € 45 |  | € 3 |  |  |  |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants |  |  |  | € 1,850 |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 1.00% |  | 1.00% |  | 1.00% | 1.00% |  |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% |  | 1.00% |
Volatility | Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  | € 48 |  | € 6 | € 16 |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible increase in unobservable input, liabilities | € / shares | € 1 |  | € 1 |  | € 1 | € 1 |  |  | € 1 | € 1 | € 1 | € 1 | € 1 | € 1 |  | € 1 |
Share price | Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  | € 197 |  | € 78 | € 176 |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 1.00% |  | 1.00% |  | 1.00% | 1.00% |  |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% |  | 1.00% |
Risk-free rate | Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  | € 64 |  | € 12 | € 69 |  |  |  |  |  |  |  |  |  |  |
Kreos A BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding warrants (in shares) | shares |  |  |  | 110,957 | 110,957 |  | 110,957 |  |  |  | 110,957 |  |  |  |  |  |
Exercise price, other equity instruments granted (in euro per share) | € / shares |  |  |  |  |  |  | € 7.21 |  |  |  |  |  |  |  |  |  |
Kreos B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding warrants (in shares) | shares |  |  |  | 74,766 | 74,766 |  | 74,766 |  |  |  | 74,766 |  |  |  |  |  |
Exercise price, other equity instruments granted (in euro per share) | € / shares |  |  |  |  |  |  | € 10.70 |  |  |  |  |  |  |  |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding warrants (in shares) | shares |  |  |  |  |  |  |  |  | 214,198 | 214,198 |  |  |  |  | 214,198 |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |
Number of shares subscribed per warrant (in shares) | shares |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Borrowings, maturity term |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Kreos 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Borrowings, exit fee percentage |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Borrowings, notice period |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Borrowings, annual discount rate |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |
Kreos 1 | Euribor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Kreos 1 | Bottom of range | Euribor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Kreos 1 | Top of range | Euribor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Borrowings, exit fee percentage |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
Borrowings, exit fee amount |  |  |  |  |  |  | € 900 |  |  |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  |  | € 0 |  |  |  |  |  |  |  |  |  |
Kreos 1, convertible bond loans, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of convertible bond loans |  |  |  |  |  |  |  | € 2,000 |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  | 67,887 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings maturity, deferral period |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Number of other share warrants repurchased (in shares) | shares |  |  |  | 43,070 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other share warrants converted (in shares) | shares |  |  |  | 67,887 |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos 1, convertible bond loans, tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of convertible bond loans |  |  |  |  |  |  |  | € 2,000 |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  | 31,696 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings maturity, deferral period |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |

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