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Financial liabilities - Heights convertible notes (Details) |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Jul. 30, 2025 EUR (€) note € / shares shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Aug. 24, 2023 EUR (€) shares € / shares | Aug. 20, 2023 EUR (€) installment shares tranche closing € / shares | Jul. 30, 2021 EUR (€) € / shares | Dec. 31, 2025 EUR (€) scenario € / shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Jul. 23, 2025 note | Jun. 21, 2024 € / shares | Mar. 28, 2024 € / shares | Nov. 02, 2023 € / shares | Feb. 22, 2023 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from convertible loan notes |  |  |  |  |  |  |  |  | € 55,841,000 |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 6.50
Repayments of convertible loan notes |  |  |  | € 33,000,000 |  |  | € 2,188,000 | € 8,750,000 | 27,188,000 |  |  |  |  |
Day-one gain on recognition of financial liabilities |  |  |  |  |  |  | 1,557,000 | 590,000 | 212,000 |  |  |  |  |
Losses on financial liabilities |  |  |  |  |  |  | € (36,015,000) | (1,367,000) | 0 |  |  |  |  |
Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 35,000,000 | € 35,000,000,000 | € 35,000,000 |  |  |  | € 35,000,000 | € 35,000,000,000 |  |  |  |  |
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% |
Volatility | Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € 2,000 | € 18,000 | € 239,000 |  |  |  |  |  |  |  |  |  |
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 |
Ordinary share price (in euro per share) | Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € 39,000 | € 352,000 | € 1,069,000 |  |  |  |  |  |  |  |  |  |
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% |
Risk-free rate | Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € (219,000) | € (366,000) | € (239,000) |  |  |  |  |  |  |  |  |  |
Held to maturity / voluntary conversion scenario probability |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  | 10.00% | 1.00% | 1.00% |  |  |  | 10.00% | 1.00% |  |  |  |  |
Held to maturity / voluntary conversion scenario probability | Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  | € (631,000) | € (364,000) | € (80,000) |  |  |  |  |  |  |  |  |  |
Heights convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum borrowing capacity |  |  |  |  | € 75,000,000 |  |  |  |  |  |  |  |  |
Borrowings, number of tranches | tranche |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Convertible loan notes, nominal value |  |  |  |  | € 100,000 |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares | € 23.7674 |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 21,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Borrowings, number of quarterly installments | installment |  |  |  |  | 16 |  |  |  |  |  |  |  |  |
Borrowings maturity, deferral period |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |
Borrowings, percentage of market price |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Borrowings, market price, number of days with lowest daily VWAP |  |  |  |  | 2 days |  |  |  |  |  |  |  |  |
Borrowings, market price, number of trading days |  |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 14.4303 |  |  |  |  |  |  |  |  |
Number of convertible notes converted | note | 200 |  |  |  |  |  |  |  |  | 150 |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) | shares | 920,377 |  |  |  |  |  |  |  |  |  |  |  |  |
Day-one gain on recognition of financial liabilities | € 1,262,000 |  |  |  | € 2,359,000 |  |  |  |  |  |  |  |  |
Unrecognition day-one gain of financial liabilities |  |  |  |  |  |  |  | € 1,557,000 | € 2,147,000 |  |  |  |  |
Number of probability-weighted scenarios | scenario |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments, equity | € 53,921,000 |  |  |  |  |  | € 53,921,000 |  |  |  |  |  |  |
Conversion option, maximum period prior to maturity date |  |  |  |  | 5 days |  |  |  |  |  |  |  |  |
Losses on financial liabilities |  |  |  |  |  |  | € 36,015,000 |  |  |  |  |  |  |
Heights convertible notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance price, percentage of discount to 15-day WVAP |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Early redemption amount, percentage of outstandong principal |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |
Heights convertible notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 14.4303 |  |  |  |  |  |  |  |  |
Settlement in shares, percentage of fair market value |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Equity issuance, cash carve-out |  |  |  |  | € 13,125,000 |  |  |  |  |  |  |  |  |
Heights convertible notes, tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from convertible loan notes |  |  |  | € 35,000,000 |  |  |  |  |  |  |  |  |  |
Number of convertible notes issued (in shares) | shares |  |  |  | 350 |  |  |  |  |  |  |  |  |  |
Convertible loan notes, nominal value |  |  |  | € 100,000 |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  | € 23.7674 |  |  |  |  |  |  |  |  |  |
Exercise price, percentage of premium |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |
Heights convertible notes, tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of convertible notes issued (in shares) | shares |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Convertible loan notes, nominal value |  |  |  |  | € 100,000 |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 40,000,000 |  |  |  |  |  |  |  |  |
Exercise price, percentage of 15-day WVAP |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |
Heights convertible notes, tranche B | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible loan notes, period |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |
Convertible loan notes, number of separate closings | closing |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Heights convertible notes, tranche B | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible loan notes, period |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
OCEANE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from convertible loan notes |  |  |  |  |  | € 25,000,000 |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  | € 30.55 |  |  |  |  |  |  |  |
Repayments of convertible loan notes |  |  |  | € 25,102,000 |  |  |  |  | € 25,000,000 |  |  |  |  |

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