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Financial Assets and Liabilities - Summary of Fair Value Hierarchy (Detail) - EUR (€)
€ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]        
Royalty funding liabilities € 298,100      
Derivative liabilities 290,482 € 256,231    
Level 3 [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative liabilities 290,482 256,231 € 174,581 € 150,670
Carrying amount [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities measured at amortized cost 746,228 720,262    
Financial liabilities measured at fair value through profit or loss 290,482 256,231    
Carrying amount [member] | Level 3 [member]        
Disclosure of detailed information about financial instruments [line items]        
Convertible senior notes 448,176 429,391    
Royalty funding liabilities 298,052 290,871    
Derivative liabilities 290,482 256,231    
Fair value [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities measured at amortized cost 751,122 723,328    
Financial liabilities measured at fair value through profit or loss 290,482 256,231    
Fair value [member] | Level 3 [member]        
Disclosure of detailed information about financial instruments [line items]        
Convertible senior notes 448,447 426,429    
Royalty funding liabilities 302,675 296,899    
Derivative liabilities € 290,482 € 256,231