v3.26.3
Financial assets and liabilities (Details)
€ in Thousands
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets € 462,209 € 584,341
Financial assets, at fair value 435,568 557,595
Financial liabilities, at fair value € 40,222 € 141,409
Credit spread, measurement input | 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%
LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value € 0 € 0
LIABILITIES AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 40,222 141,409
Financial liabilities-non current portion    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 137 102,555
Financial liabilities-non current portion | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Financial liabilities-non current portion | LIABILITIES AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 137 102,555
Financial liabilities-current portion    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 1,075 1,302
Financial liabilities-current portion | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Financial liabilities-current portion | LIABILITIES AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 1,075 1,302
Trade payables and other current liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 39,010 37,552
Trade payables and other current liabilities | LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 0 0
Trade payables and other current liabilities | LIABILITIES AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities, at fair value 39,010 37,552
ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 166,055 437,031
ASSETS AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 269,513 120,565
Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 435,663 557,226
Financial liabilities 40,222 69,644
Recurring fair value measurement | Financial liabilities-non current portion    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 137 30,790
Recurring fair value measurement | Financial liabilities-current portion    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1,075 1,302
Recurring fair value measurement | Trade payables and other current liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 39,010 37,552
Other financial assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 28,057 27,141
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
Other financial assets | ASSETS AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 28,057 27,141
Other financial assets | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 28,152 26,772
Other receivables and assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 19,520 13,769
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
Other receivables and assets | ASSETS AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 19,520 13,769
Other receivables and assets | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 19,520 13,769
Long-term advances made to CROs | Recurring fair value measurement | Credit spread, measurement input | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Decrease in financial assets at fair value € 202 € 231
Long-term advances made to CROs | Recurring fair value measurement | Bottom of range | Credit spread, measurement input | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets 0.0034 0.0034
Long-term advances made to CROs | Recurring fair value measurement | Top of range | Credit spread, measurement input | Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets 0.0081 0.0131
Cash and cash equivalents    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value € 387,992 € 516,685
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 166,055 437,031
Cash and cash equivalents | ASSETS AT AMORTIZED COST    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets, at fair value 221,936 79,654
Cash and cash equivalents | Recurring fair value measurement    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets € 387,992 € 516,685