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Financial risk management - Disclosure of trade receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables € 48,868 € 39,781  
Loss allowance (6,211) (6,308) € (5,904)
Not yet due      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 33,279 28,046  
0-90 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 10,498 8,816  
Loss allowance   (63)  
90-180 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 4,332 1,135  
Loss allowance   (285)  
>180 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 759 1,784  
Loss allowance   (5,960)  
Gross carrying amount [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 55,079 46,089  
Loss allowance (6,211)    
Gross carrying amount [member] | Not yet due      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 33,279 28,046  
Gross carrying amount [member] | 0-90 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 10,616 8,879  
Loss allowance (118)    
Gross carrying amount [member] | 90-180 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 4,618 1,420  
Loss allowance (286)    
Gross carrying amount [member] | >180 days overdue      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 6,566 € 7,744  
Loss allowance € (5,807)