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Financial liabilities - OCEANE (Details) € / shares in Units, € in Thousands, $ in Millions |  |  |  |  |  | 12 Months Ended | 145 Months Ended |  |  |  |
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Dec. 23, 2025 EUR (€) | Oct. 24, 2023 EUR (€) shares | Oct. 24, 2023 USD ($) shares | Aug. 24, 2023 EUR (€) € / shares | Feb. 22, 2023 € / shares shares | Jul. 30, 2021 EUR (€) € / shares shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2025 EUR (€) € / shares | Jun. 21, 2024 € / shares | Mar. 28, 2024 € / shares | Nov. 02, 2023 € / shares | Aug. 20, 2023 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  | 20,325,500 | 20,325,500 |  | 20,000,000 |  | 11,679,400 |  | 40,325,500 |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 6.50 |  |  |  |  |  |  |  |  |
Capital increases |  | € 223,300 | $ 235.8 |  |  |  | € 648,124 | € 0 | € 353,377 | € 1,194,700 |  |  |  |
Net proceeds from convertible loan notes |  |  |  |  |  |  |  |  | 55,841 |  |  |  |  |
Repayments of convertible loan notes |  |  |  | € 33,000 |  |  | € 2,188 | € 8,750 | € 27,188 |  |  |  |  |
Loss of extinguishment | € 3,838 |  |  |  |  |  |  |  |  |  |  |  |  |
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%
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
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%
OCEANE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of convertible notes |  |  |  | € 1,762 |  |  |  |  |  |  |  |  |  |
OCEANE | Volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets |  |  |  | € 80 |  |  |  |  |  |  |  |  |  |
OCEANE | Volatility | Monte Carlo model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  | 0.37 |  | 0.53 |  |  |  |  |  |  |  |
OCEANE | Credit spread | Monte Carlo model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  | 0.1398 |  | 0.1400 |  |  |  |  |  |  |  |
OCEANE | 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 |  |  |  | € 364 |  |  |  |  |  |  |  |  |  |
OCEANE | Ordinary share price (in euro per share) | Monte Carlo model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities | € / shares |  |  |  | 16.74 |  | 31.50 |  |  |  |  |  |  |  |
OCEANE | 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 |  |  |  | € 121 |  |  |  |  |  |  |  |  |  |
OCEANE | Risk-free rate | Monte Carlo model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant unobservable input, liabilities |  |  |  | 0.0322 |  |  |  |  |  |  |  |  |  |
OCEANE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuing shares and convertible loan notes |  |  |  |  |  | € 85,000 |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  |  |  |  | 1,964,031 |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  | € 30.55 |  |  |  |  |  |  |  |
Capital increases |  |  |  |  |  | € 60,000 |  |  |  |  |  |  |  |
Net proceeds from convertible loan notes |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |
Repayments of convertible loan notes |  |  |  | € 25,102 |  |  |  |  | € 25,000 |  |  |  |  |
Loss of extinguishment |  |  |  |  |  |  | € 3,069 |  |  |  |  |  |  |
OCEANE | After 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price, adjustment, period |  |  |  |  |  | 18 months |  |  |  |  |  |  |  |
OCEANE | After 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price, adjustment, period |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |
OCEANE | After 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price, adjustment, period |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |

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