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Intangible Assets - Summary of Goodwill (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period € 5,272  
Intangible assets at ending period 4,828 € 5,272
Goodwill [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period 3,495  
Intangible assets at ending period 3,495 3,495
Computer software [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period 1,777  
Intangible assets at ending period 1,333 1,777
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period 5,717 5,717
Intangible assets at ending period 5,717 5,717
Gross carrying amount [member] | Goodwill [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period 3,495 3,495
Intangible assets at ending period 3,495 3,495
Gross carrying amount [member] | Computer software [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period 2,222 2,222
Intangible assets at ending period 2,222 2,222
Accumulated impairment [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period (445)  
Amortization Charge (444) (445)
Intangible assets at ending period (889) (445)
Accumulated impairment [member] | Computer software [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets at beginning period (445)  
Amortization Charge (444) (445)
Intangible assets at ending period € (889) € (445)