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Financial liabilities - Royalty certificates (Details) € / shares in Units, € in Thousands |  |  |  |  |  |  |  | 12 Months Ended | 121 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 | Dec. 31, 2022 EUR (€) € / shares | Sep. 07, 2022 EUR (€) € / shares shares | Sep. 02, 2022 EUR (€) transaction € / shares shares | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2022 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares | 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 | Apr. 01, 2022 € / shares | Dec. 31, 2021 € / shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity |  |  |  |  | € 130,000 |  |  | € 46,231 |  |  | € 353,377 |  | € 46,231 |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) | shares |  |  |  | 20,325,500 | 20,000,000 |  |  | 5,530,000 |  |  | 40,325,500 |  | 5,530,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  | € 0.01 |  |  |  |  |  | € 0.01 |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  | € 6.50 |  |  | € 8.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of royalty certificates |  |  |  |  |  |  |  |  | € 2,931 | € 0 | € 0 |  | € 2,931 |  | € 2,900 |  |  |  |  |  |  |  |  |  |
Royalty certificate, percentage of future sales |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificate, maximum amount |  |  |  |  |  |  |  |  | € 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  |  |  | 28,111 |  | 3,280 |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | € 13,023 | € 12,229 | [1] |  |  | € 3,287 | [1] |  |  | 13,023 | 12,229 | [1] | 3,287 | [1] | 12,229 | [1] |  |  |  |  |  |  |  |  |
Decrease in interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through amortization cost remeasurement |  |  |  |  |  |  |  |  |  | (3,404) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on royalty certificates |  |  |  |  |  |  |  |  |  | 794 | 8,942 |  | 356 |  |  |  |  |  |  |  |  |  |  |  |
Unwinding of discount on royalties |  |  |  |  |  |  |  |  |  | 4,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities, at fair value | € 162,256 | € 125,191 |  |  |  | € 58,469 |  |  |  | € 162,256 | € 125,191 |  | € 58,469 |  | € 125,191 |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible increase in unobservable input, liabilities | € / shares | € 1 | € 1 |  |  |  | € 1 |  |  |  | € 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 |  |  |  |  |  |  |  |  |  | € (3,404) | € 6,421 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | € 49,162 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities, number of transactions | transaction |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity |  |  |  |  |  |  |  |  | € 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% |  |  |  |  |  |  |  |  |  |
Financial liabilities, at fair value | € 7,313 | € 12,395 |  |  |  | € 3,307 |  |  |  | € 7,313 | € 12,395 |  | € 3,307 |  | € 12,395 |  |  |  |  |  |  |  |  |  |
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% |  | 0.05% |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € 572 | € 1,104 |  |  |  | € 299 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (0.05%) | (0.05%) |  |  |  | (0.05%) |  |  |  | (0.05%) | (0.05%) |  | (0.05%) |  | (0.05%) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (572) | € (1,104) |  |  |  | € (294) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  | 5.00% |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € 1,735 | € 1,757 |  |  |  | € 221 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (5.00%) | (5.00%) |  |  |  | (5.00%) |  |  |  | (5.00%) | (5.00%) |  | (5.00%) |  | (5.00%) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (2,527) | € (2,311) |  |  |  | € (347) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  | 1.00% |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | € (314) | € (577) |  |  |  | € (191) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | (1.00%) | (1.00%) |  |  |  | (1.00%) |  |  |  | (1.00%) | (1.00%) |  | (1.00%) |  | (1.00%) |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € 332 | € 612 |  |  |  | € 205 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty certificates | Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input | 1,160 | 1,325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input | € (1,160) | € (1,325) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible increase in unobservable input, liabilities | € / shares | € 1 | € 1 |  |  |  |  |  |  |  | € 1 | € 1 |  |  |  | € 1 |  |  |  |  |  |  |  |  |  |
Amount of reasonably possible decrease in unobservable input, liabilities | € / shares | € (1) | € (1) |  |  |  |  |  |  |  | € (1) | € (1) |  |  |  | € (1) |  |  |  |  |  |  |  |  |  |
Share premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity |  |  |  |  |  |  |  |  |  |  | € 352,974 |  | € 46,176 |  |  |  |  |  |  |  |  |  |  |  |
Share premium | Royalty certificates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  |  |  |  |  | € 3,280 |  |  |  |  |  |  |  |  |  |  |  |
[1] | 1 In application of the Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-current, and Non-current Liabilities with Covenants, the non-current portion of the OCEANE bonds as of December 31, 2022, amounting to €19,332 thousand, and the non-current portion of the Heights convertible notes as of December 31, 2023, amounting to €20,652 thousand, were reclassified within the current liabilities (Convertible loan notes) as of December 31, 2022 and 2023 respectively (see Note 2).

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