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Financial assets and liabilities (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
EUR (€)
tranche
Dec. 31, 2023
EUR (€)
Aug. 22, 2023
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets € 205,228 € 327,062   € 584,341 € 205,228 € 327,062
Financial assets, at fair value 176,754 301,500   557,595 176,754 301,500
Financial liabilities, at fair value € 162,256 € 125,191   € 141,409 € 162,256 € 125,191
Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Percentage of reasonably possible increase in unobservable input, liabilities 1.00% 1.00% 1.00%   1.00% 1.00%
Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Percentage of reasonably possible increase in unobservable input, assets 1.00% 1.00%   1.00% 1.00% 1.00%
Percentage of reasonably possible increase in unobservable input, liabilities       1.00%    
Financial liabilities-non current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value € 73,497 € 40,622   € 102,555 € 73,497 € 40,622
Kreos & Claret Financing, Tranche A,B and C            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Number of tranches | tranche 3          
Financial liabilities-current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value € 44,935 37,348   1,302 44,935 37,348
Trade payables and other current liabilities            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 43,824 47,221   37,552 43,824 47,221
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 24,803 30,037   0 24,803 30,037
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Financial liabilities-non current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 3,620 18,506   0 3,620 18,506
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Financial liabilities-current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 21,183 11,531   0 21,183 11,531
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS | Trade payables and other current liabilities            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 0 0   0 0 0
LIABILITIES AT AMORTIZED COST            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 137,453 95,154   141,409 137,453 95,154
LIABILITIES AT AMORTIZED COST | Financial liabilities-non current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 69,877 42,768   102,555 69,877 42,768
LIABILITIES AT AMORTIZED COST | Financial liabilities-current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 23,752 5,165   1,302 23,752 5,165
LIABILITIES AT AMORTIZED COST | Trade payables and other current liabilities            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities, at fair value 43,824 47,221   37,552 43,824 47,221
ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 0 0   437,031 0 0
ASSETS AT AMORTIZED COST            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 176,754 301,500   120,565 176,754 301,500
Recurring fair value measurement            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets 177,537 301,161   557,226 177,537 301,161
Financial liabilities 157,828 124,266   69,644 157,828 124,266
Recurring fair value measurement | Financial liabilities-non current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities € 69,069 € 39,697   30,790 € 69,069 € 39,697
Recurring fair value measurement | Kreos & Claret Financing, Tranche A,B and C | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Significant unobservable input, liabilities 0.0750 0.0900 0.0960   0.0750 0.0900
Decrease in financial liabilities at fair value € 958          
Recurring fair value measurement | Kreos & Claret convertible notes (OCABSA) | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial liabilities at fair value   € 538 € 624      
Recurring fair value measurement | Conditional advances and PGE loan | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Significant unobservable input, liabilities 0.0730 0.0900     0.0730 0.0900
Recurring fair value measurement | PGE | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial liabilities at fair value € 21 € 39        
Recurring fair value measurement | RNP-VIR conditional advance | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial liabilities at fair value   15        
Recurring fair value measurement | CARENA conditional advance | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial liabilities at fair value   37        
Recurring fair value measurement | Ebola conditional advance | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial liabilities at fair value   1        
Recurring fair value measurement | Financial liabilities-current portion            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities 44,935 37,348   1,302 € 44,935 € 37,348
Recurring fair value measurement | Trade payables and other current liabilities            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial liabilities 43,824 47,221   37,552 43,824 47,221
Other financial assets            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 12,690 22,394   27,141 12,690 22,394
Other financial assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 0 0   0 0 0
Other financial assets | ASSETS AT AMORTIZED COST            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 12,690 22,394   27,141 12,690 22,394
Other financial assets | Recurring fair value measurement            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets 13,473 22,055   26,772 13,473 22,055
Other receivables and assets            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 19,843 27,164   13,769 19,843 27,164
Other receivables and assets | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 0 0   0 0 0
Other receivables and assets | ASSETS AT AMORTIZED COST            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 19,843 27,164   13,769 19,843 27,164
Other receivables and assets | Recurring fair value measurement            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets 19,843 27,164   13,769 19,843 27,164
Cash and cash equivalents            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 144,221 251,942   516,685 144,221 251,942
Cash and cash equivalents | ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 0 0   437,031 0 0
Cash and cash equivalents | ASSETS AT AMORTIZED COST            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets, at fair value 144,221 251,942   79,654 144,221 251,942
Cash and cash equivalents | Recurring fair value measurement            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Financial assets € 144,221 € 251,942   516,685 144,221 251,942
Long-term advances made to CROs | Recurring fair value measurement | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Decrease in financial assets at fair value       € 231 € 235 € 23
Long-term advances made to CROs | Recurring fair value measurement | Bottom of range | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Significant unobservable input, assets 0.0131 0.0104   0.0034 0.0131 0.0104
Long-term advances made to CROs | Recurring fair value measurement | Top of range | Credit spread | Discounted cash flow            
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]            
Significant unobservable input, assets 0.0271 0.0218   0.0131 0.0271 0.0218