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Financial liabilities - Kreos / Claret Financing (Details) € / shares in Units, € in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 145 Months Ended |  |
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Dec. 23, 2025 EUR (€) | Nov. 25, 2025 EUR (€) € / shares shares | Aug. 28, 2025 EUR (€) shares | Aug. 08, 2025 EUR (€) € / shares shares | Jul. 30, 2025 EUR (€) shares | 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 (€) € / shares | Aug. 20, 2023 EUR (€) tranche € / shares shares | Oct. 31, 2020 shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares | Dec. 31, 2025 EUR (€) € / shares | Aug. 31, 2025 EUR (€) | Aug. 24, 2023 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 175,000 |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 464,309 |  | 4,000 |  |  |  |
Exercises of the Kreos/Claret and other share warrants |  |  | € 11,531 |  | € 15,143 |  |  |  |  |  |  |  |  |  |  | € 45 |  |  |  |
Interest expense on borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 95 | 85 | € 176 |  |  |
Loss of extinguishment | € 3,838 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities, at fair value |  |  |  |  |  | € 162,256 |  |  |  | € 125,191 |  |  |  |  | 141,409 | 162,256 | 125,191 | € 141,409 |  |
Non-cash changes: other fair value remeasurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,002 | 1,367 | (3,198) |  |  |
Kreos & Claret bond loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash changes: other fair value remeasurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0 | € 0 | € 0 |  |  |
Market rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Ordinary share price (in euro per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible increase in unobservable input, liabilities (in euro per share) | € / shares |  |  |  |  |  | € 1 | € 1 |  | € 1 | € 1 | € 1 |  | € 1 |  | € 1 | € 1 | € 1 | € 1 |  | € 1
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%
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%
Final redemption scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  | 5.00% |  | 5.00% |  |  |  |  |  | 10.00% |  |  | 10.00% |  |
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% |  |
7-year expiry scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  | 5.00% |  |  |  |  | 5.00% |  | 5.00% |  | 10.00% | 5.00% |  | 10.00% |  |
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 |  |  |  |  |  |  |
Kreos A & B BSA | Market rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 0.126 |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  |  |  |  |  |  |  | € 624 |  |  |  |  |  |  |
Kreos A & B BSA | Ordinary share price (in euro per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  |  |  | 197 |  |  |  |  |  |  |
Kreos A & B BSA | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  |  |  |
Kreos A & B BSA | Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  |  |  | 64 |  |  |  |  |  |  |
Kreos A & B BSA | 7-year expiry scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  |  |  | € 64 |  |  |  |  |  |  |
Kreos & Claret minimal return indemnifications | Ordinary share price (in euro per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
Kreos & Claret minimal return indemnifications | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
Kreos & Claret minimal return indemnifications | Volatility | Black Scholes Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  | 0.601 |  | 0.603 |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret minimal return indemnifications | Volatility | Monte Carlo Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  | 0.599 |  | 0.619 |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret minimal return indemnifications | Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
Kreos & Claret minimal return indemnifications | Risk-free rate | Black Scholes Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  | 0.030 |  | 0.026 |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret minimal return indemnifications | Risk-free rate | Monte Carlo Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  |  |  |  | 0.031 |  | 0.028 |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret minimal return indemnifications | Final redemption scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Kreos & Claret minimal return indemnifications | Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
Kreos A & B & C BSA | Ordinary share price (in euro per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA | Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA | 7-year expiry scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 C BSA | Ordinary share price (in euro per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  | € 232 |  |  |  |  |  |  |  |  |
Kreos C BSA | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |
Kreos C BSA | Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  | 42 |  |  |  |  |  |  |  |  |
Kreos C BSA | 7-year expiry scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |
Kreos & Claret Financing, Tranche A,B and C | Kreos & Claret minimal return indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of other equity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3,620 |
Kreos & Claret financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 525,913 |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 33,768 |  |  |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of other equity instruments |  |  |  |  |  | 243 |  |  |  | 920 |  | € 2,092 |  |  |  | € 243 | € 920 |  |  |
Expiry scenario period, other equity instruments granted |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  | 7 years |  |  |  |  |
Kreos C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of other equity instruments |  |  |  |  |  | € 923 |  |  |  | € 1,659 | € 1,493 |  |  |  |  | € 923 | € 1,659 |  |  |
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 convertible notes (OCABSA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  |  |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  | € 21.2209 |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |
Borrowings, early repayment, discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Borrowings, exit fee percentage |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |
Kreos & Claret convertible notes (OCABSA) | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  | € 21.2209 |  | € 21.2209 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible instruments (in shares) | shares |  | 392,695 |  | 785,389 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments, equity |  | € 8,296 |  | € 16,058 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 & 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% |  |  |  |  |  |  |
Borrowings, discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  | 4.00% |  |
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 1 bond loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bond loans |  |  |  |  |  |  |  |  |  |  |  | € 7,661 |  |  |  |  |  |  |  |
Kreos A & B & C BSA | Kreos & Claret financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants repurchased (in shares) | shares |  |  |  |  | 94,117 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos A & B & C BSA | Ordinary shares | Kreos & Claret financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercises of share warrants (in shares) | shares |  |  | 206,662 |  | 319,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants |  |  | € 14,198 |  | € 19,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos/Claret financing B and C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities | 33,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 29,903 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit paid, borrowing | € 1,081 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, discount rate | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings | € 2,001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, exit fee amount | 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 29,985 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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