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Financial liabilities - Kreos / Claret Financing (Details) € / shares in Units, € in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  | 12 Months Ended | 121 Months Ended |  |  |
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Dec. 31, 2024 EUR (€) € / shares | Jun. 21, 2024 EUR (€) € / shares | Jun. 21, 2024 USD ($) | Mar. 28, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Nov. 02, 2023 EUR (€) € / shares shares | Aug. 22, 2023 EUR (€) | Aug. 20, 2023 EUR (€) tranche € / shares shares | Dec. 31, 2022 EUR (€) € / shares | Dec. 31, 2021 EUR (€) € / shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Dec. 31, 2022 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Aug. 24, 2023 € / shares | Apr. 01, 2022 € / shares | Jul. 24, 2018 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | € 175,000 |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  | € 0.14 |  |  |  | € 0.14 |  |  |  |
Repayments of bond loans |  |  |  |  |  |  |  |  |  |  | € 0 | € 11,635 | € 9,410 |  |  |  |
Financial liabilities, at fair value | € 162,256 |  |  |  | € 125,191 |  |  |  | € 58,469 |  | € 162,256 | € 125,191 | € 58,469 | € 125,191 |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities, at fair value |  |  |  |  |  |  |  | € 23,995 |  |  |  |  |  |  |  |  |
Convertible loans notes |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |
Carrying amount of the equity component |  |  |  |  |  |  |  | € 1,005 |  |  |  |  |  |  |  |  |
Market rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Market rate | Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  |  | 0.126 |  |  |  |  |  |  |  |  |
Decrease in financial liabilities at fair value |  |  |  |  |  |  |  | € 624 |  |  |  |  |  |  |  |  |
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 | € 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 |  |  |  |  |  |  |
Share price | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  | € 232 |  |  |  |  |  |  |  |  |  |  |
Share price | Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | € 350 |  |  |  | € 401 |  |  |  |  |  |  |  |  |  |  |  |
Share price | Kreos & Claret minimum return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities | € / shares |  | 12.94 |  | 13.40 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € (16) |  | € (30) |  |  |  |  |  |  | € (3) |  |  |  |  |  |
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% | 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 |  |  |  |  |  |  |
Volatility | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  | € 28 |  |  |  |  |  |  |  |  |  |  |
Volatility | Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | € 37 |  |  |  | € 96 |  |  |  |  |  |  |  |  |  |  |  |
Volatility | Kreos & Claret minimum return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € 4 |  | € 4 |  |  |  |  |  |  | € (1) |  |  |  |  |  |
Volatility | Kreos & Claret minimum return indemnifications | Black Scholes Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  | 0.601 |  | 0.603 |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility | Kreos & Claret minimum return indemnifications | Monte Carlo Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  | 0.599 |  | 0.619 |  |  |  |  |  |  |  |  |  |  |  |  |
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% | 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 |  |  |  |  |  |  |
Risk-free rate | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  | € 42 |  |  |  |  |  |  |  |  |  |  |
Risk-free rate | Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | € 61 |  |  |  | € 95 |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate | Kreos & Claret minimum return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € 8 |  | € (3) |  |  |  |  |  |  | € (3) |  |  |  |  |  |
Risk-free rate | Kreos & Claret minimum return indemnifications | Black Scholes Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  | 0.030 |  | 0.026 |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate | Kreos & Claret minimum return indemnifications | Monte Carlo Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  | 0.031 |  | 0.028 |  |  |  |  |  |  |  |  |  |  |  |  |
Final redemption scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% | 5.00% |  | 5.00% |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Final redemption scenario probability | Kreos & Claret minimum return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € 46 |  | € 35 |  |  |  |  |  |  | € 3 |  |  |  |  |  |
Discount 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% |  |  |  |  |  |
Discount rate | Kreos & Claret minimum return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € (13) |  | € (53) |  |  |  |  |  |  | € (82) |  |  |  |  |  |
7-year expiry scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% |  |  |  | 5.00% | 5.00% |  | 5.00% |  |  | 10.00% | 5.00% |  | 5.00% |  |  |
7-year expiry scenario probability | 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 |  |  |  |  |  |  |  |  |
7-year expiry scenario probability | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  | € 36 |  |  |  |  |  |  |  |  |  |  |
7-year expiry scenario probability | Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | € 75 |  |  |  | € 76 |  |  |  |  |  |  |  |  |  |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1
Expiry scenario period, other equity instruments granted |  |  |  |  |  |  |  | 7 years |  |  | 7 years |  |  |  |  |  |
Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiry scenario period, other equity instruments granted |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiry scenario period, other equity instruments granted | 7 years |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  |  |  |  |  |  | € 75,000 |  |  |  |  |  |  |  |  |
Borrowings, number of tranches | tranche |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity per tranche |  |  |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |
Other share warrants, exercise period |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |
Kreos & Claret financing | Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  | € 1.00 |  |  |  |  |  |  |  |  |
Number of warrants granted (in shares) | shares |  |  |  |  |  |  |  | 214,198 |  |  |  |  |  |  |  |  |
Exercise price, other equity instruments granted (in euro per share) | € / shares |  |  |  |  |  |  |  | € 18.6744 |  |  |  |  |  |  |  |  |
Exercise price, percentage of premium |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Kreos & Claret financing | Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants granted (in shares) | shares |  |  |  |  |  | 405,832 |  |  |  |  |  |  |  |  |  |  |
Exercise price, other equity instruments granted (in euro per share) | € / shares |  |  |  |  |  | € 9.86 |  |  |  |  |  |  |  |  |  |  |
Exercise price, percentage of 15-day WVAP |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |
Issuance of other share warrants |  |  |  |  |  | € 4,000 |  |  |  |  |  |  |  |  |  |  |
Number of instruments granted, percentage exercisable immediately |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Number of instruments granted, remaining percentage exercisable |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price | € / shares |  |  |  |  |  |  |  | € 21.2209 |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |
Borrowings, early repayment, discount rate |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Borrowings, exit fee percentage |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche B and C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, number of tranches | tranche |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Borrowings, early repayment, discount rate |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Borrowings, exit fee percentage |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche B and C | European Central Bank base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 7.50% |  |  |  |  |  |  | 7.50% |  |  | 7.50% |  |  |  |  |  |
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis | 2.50% |  |  |  |  |  |  | 2.50% |  |  | 2.50% |  |  |  |  |  |
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis | 4.00% |  |  |  |  |  |  | 4.00% |  |  | 4.00% |  |  |  |  |  |
Kreos & Claret financing, tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, debt-to-market capitalization ratio |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret financing, tranche C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | € 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, debt-to-market capitalization ratio |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance conditions, minimum financing | $ |  |  | $ 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos 1 bond loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bond loans |  |  |  |  |  |  | € 7,661 |  |  |  |  |  |  |  |  |  |

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