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Financial liabilities - Royalty certificates (Details) € / shares in Units, € in Thousands |  |  |  |  |  | 12 Months Ended | 145 Months Ended |  |  |  |  |  |  |  |
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Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares | Oct. 24, 2023 € / shares shares | Feb. 22, 2023 EUR (€) € / shares shares | Sep. 02, 2022 EUR (€) transaction € / shares shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2022 EUR (€) | Dec. 31, 2025 EUR (€) € / shares | Sep. 30, 2025 | Nov. 19, 2024 € / shares | Jun. 21, 2024 € / shares | Mar. 28, 2024 € / shares | Nov. 02, 2023 € / shares | Aug. 24, 2023 € / shares | Aug. 20, 2023 € / shares | May 24, 2023 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  | € 130,000 |  | € 637,462 |  | € 353,377 |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  | 20,325,500 | 20,000,000 |  | 11,679,400 |  | 40,325,500 |  |  |  |  |  |  |  |  |  |
Par value per share (in euro per share) | € / shares | € 0.01 | € 0.01 | € 0.01 | € 0.01 |  | € 0.01 | € 0.01 | € 0.01 |  | € 0.01 |  | € 0.01 |  |  |  |  |  | € 0.01
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  | € 6.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of royalty certificates |  |  |  |  | € 2,931 |  |  |  |  | € 2,900 |  |  |  |  |  |  |  |
Royalty certificate, percentage of future sales |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificate, maximum amount |  |  |  |  | € 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  | € 28,111 |  |  |  |  |  |  |  |  |  |
Increase (decrease) through amortization cost remeasurement |  |  |  |  |  | € 11,278 | € (3,404) | 5,878 |  |  |  |  |  |  |  |  |  |
Interest expense on royalty certificates, including the unwinding of discount |  |  |  |  |  |  | 794 | 8,942 |  |  |  |  |  |  |  |  |  |
Unwinding of discount on royalties |  |  |  |  |  |  | 4,198 |  |  |  |  |  |  |  |  |  |  |
Financial liabilities, at fair value | € 162,256 | € 125,191 |  |  |  | € 141,409 | € 162,256 | € 125,191 |  | € 141,409 |  |  |  |  |  |  |  |
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% |  |  |  |
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 |
Royalty certificates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through amortization cost remeasurement |  |  |  |  |  | € 11,286 | € (3,404) | € 6,421 |  |  |  |  |  |  |  |  |  |
PREMIUMS RELATED TO SHARE CAPITAL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  |  |  | 637,345 |  | € 352,974 |  |  |  |  |  |  |  |  |  |
Royalty certificates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 49,162 |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities, number of transactions | transaction |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares |  |  |  |  | € 46,231 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  |  |  | 5,530,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Par value per share (in euro per share) | € / shares |  |  |  |  | € 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 8.36 |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificate, percentage of future sales |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificate, maximum amount |  |  |  |  | € 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates, EIR | 34.00% | 34.00% |  |  |  |  | 34.00% | 34.00% |  |  | 34.00% |  |  |  |  |  |  |
Financial liabilities, at fair value | € 7,313 | € 12,395 |  |  |  | € 102,001 | € 7,313 | € 12,395 |  | € 102,001 |  |  |  |  |  |  |  |
Unobservable input, liabilities, discount rate |  |  |  |  |  | 7.50% |  |  |  | 7.50% |  |  |  |  |  |  |  |
Royalty certificates | POS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 0.05% | 0.05% |  |  |  | 0.05% | 0.05% | 0.05% |  | 0.05% |  |  |  |  |  |  |  |
Increase (decrease) in carrying value due to reasonably possible increase in unobservable input liabilities |  |  |  |  |  | € 809 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (0.05%) | (0.05%) |  |  |  | (0.05%) | (0.05%) | (0.05%) |  | (0.05%) |  |  |  |  |  |  |  |
Increase (decrease) in carrying value due to reasonably possible decrease in unobservable input liabilities |  |  |  |  |  | € (1,712) |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € 572 | € 1,104 |  |  |  | 5,810 |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (572) | € (1,104) |  |  |  | € (5,810) |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | Peak penetration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 5.00% | 5.00% |  |  |  | 5.00% | 5.00% | 5.00% |  | 5.00% |  |  |  |  |  |  |  |
Increase (decrease) in carrying value due to reasonably possible increase in unobservable input liabilities |  |  |  |  |  | € 2,616 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (5.00%) | (5.00%) |  |  |  | (5.00%) | (5.00%) | (5.00%) |  | (5.00%) |  |  |  |  |  |  |  |
Increase (decrease) in carrying value due to reasonably possible decrease in unobservable input liabilities |  |  |  |  |  | € (4,154) |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € 1,735 | € 1,757 |  |  |  | 2,830 |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (2,527) | € (2,311) |  |  |  | € (5,590) |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | WACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (1.00%) | (1.00%) |  |  |  | (1.00%) | (1.00%) | (1.00%) |  | (1.00%) |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € (314) | € (577) |  |  |  | € (4,940) |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € 332 | € 612 |  |  |  | € 5,251 |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | 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 |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € 1,160 | € 1,325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible decrease in unobservable input, liabilities (in euro per share) | € / shares | € (1) | € (1) |  |  |  |  | € (1) | € (1) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (1,160) | € (1,325) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | PREMIUMS RELATED TO SHARE CAPITAL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  | € 3,280 |  |  |  |  |  |  |  |  |

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