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Financial liabilities - Disclosure of remaining contractual maturities of financial liabilities (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Conditional advances € 0 € 0 € 6,771  
Conditional advances, undiscounted cash flows     6,813  
Royalty certificates 30,237 13,023 12,229  
Royalty certificates, undiscounted cash flows 0 0 0  
Lease liabilities 1,856 2,363 540 € 1,384
Gross lease liabilities 1,906 2,512 575  
Derivative financial liabilities 0 4,786 2,579 566
Derivative financial liabilities, undiscounted cash flows   4,786 2,579  
Total financial liabilities 32,093 114,004 77,045  
Financial liabilities, undiscounted cash flows 1,906 122,680 81,500  
LESS THAN 1 YEAR        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Conditional advances, undiscounted cash flows     3,697  
Royalty certificates, undiscounted cash flows 0 0 0  
Gross lease liabilities 1,340 993 406  
Derivative financial liabilities, undiscounted cash flows   1,166 2,579  
Financial liabilities, undiscounted cash flows 1,340 38,468 20,747  
FROM 1 TO 2 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Conditional advances, undiscounted cash flows     1,490  
Royalty certificates, undiscounted cash flows 0 0 0  
Gross lease liabilities 450 996 162  
Derivative financial liabilities, undiscounted cash flows   0 0  
Financial liabilities, undiscounted cash flows 450 56,698 15,192  
FROM 2 TO 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Conditional advances, undiscounted cash flows     1,626  
Royalty certificates, undiscounted cash flows 0 0 0  
Gross lease liabilities 116 516 7  
Derivative financial liabilities, undiscounted cash flows   3,620 0  
Financial liabilities, undiscounted cash flows 116 27,507 45,561  
LONGER THAN 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Conditional advances, undiscounted cash flows     0  
Royalty certificates, undiscounted cash flows 0 0 0  
Gross lease liabilities 0 7 0  
Derivative financial liabilities, undiscounted cash flows   0 0  
Financial liabilities, undiscounted cash flows 0 7 0  
Heights convertible notes        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes   21,574 29,605  
Convertible loans notes, undiscounted cash flows   24,063 36,750  
Heights convertible notes | LESS THAN 1 YEAR        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   8,750 10,522  
Heights convertible notes | FROM 1 TO 2 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   8,750 9,997  
Heights convertible notes | FROM 2 TO 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   6,563 16,231  
Heights convertible notes | LONGER THAN 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   0 0  
Kreos & Claret convertible notes (OCABSA)        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes   23,370 21,643  
Convertible loans notes, undiscounted cash flows   30,653 30,903  
Derivative financial liabilities € 0 1,166 2,579 € 0
Kreos & Claret convertible notes (OCABSA) | LESS THAN 1 YEAR        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   2,250 2,250  
Kreos & Claret convertible notes (OCABSA) | FROM 1 TO 2 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   19,943 2,250  
Kreos & Claret convertible notes (OCABSA) | FROM 2 TO 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   8,460 26,403  
Kreos & Claret convertible notes (OCABSA) | LONGER THAN 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   0 0  
Kreos/Claret bond loans        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes   46,401    
Convertible loans notes, undiscounted cash flows   58,080    
Kreos/Claret bond loans | LESS THAN 1 YEAR        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   24,016    
Kreos/Claret bond loans | FROM 1 TO 2 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   25,715    
Kreos/Claret bond loans | FROM 2 TO 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   8,348    
Kreos/Claret bond loans | LONGER THAN 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Convertible loans notes, undiscounted cash flows   0    
PGE        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Borrowings   2,488 3,678  
Borrowings, undiscounted cash flows   2,586 3,880  
PGE | LESS THAN 1 YEAR        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Borrowings, undiscounted cash flows   1,293 1,293  
PGE | FROM 1 TO 2 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Borrowings, undiscounted cash flows   1,293 1,293  
PGE | FROM 2 TO 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Borrowings, undiscounted cash flows   0 1,293  
PGE | LONGER THAN 5 YEARS        
Disclosure of maturity analysis for derivative financial liabilities [line items]        
Borrowings, undiscounted cash flows   € 0 € 0