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Financial liabilities - Disclosure of the main data and assumptions, Heights convertible loan notes (Details) - Heights convertible notes, tranche A € in Thousands | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares shares | Aug. 24, 2023 EUR (€) € / shares shares
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Disclosure of financial liabilities [line items] |  |  |
Number of outstanding notes (in shares) | shares | 350 | 350 | 350
Original principal amount | € | € 35,000 | € 35,000,000 | € 35,000
Fair value of convertible notes | € | € 20,017 | € 27,456 | € 32,641
Interest rate | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.06 | 0.06 | 0.06
Conversion price per share (in euro per share) | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 23.77 | 23.77 | 23.77
Ordinary share price (in euro per share) | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 6.76 | 9.82 | 16.74
Held to maturity / voluntary conversion scenario probability | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.75 | 0.75 | 0.75
Initial price limit (in euro per share) | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 14.43 | 14.43 | 14.43
Early redemption amount (put event) | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 1.20 | 1.20 | 1.20
Volatility | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.50 | 0.50 | 0.50
Credit spread | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.25 | 0.20 | 0.20
Risk-free rate | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.029 | 0.023 | 0.029

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