Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Segmentation - Summary of the Amount of Total Non-Current Assets (Detail)

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Segmentation - Summary of the Amount of Total Non-Current Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Non Current Assets By Country [Line Items]    
Non-current assets € 80,231 € 58,087
The Netherlands    
Disclosure of Non Current Assets By Country [Line Items]    
Non-current assets 59,047 38,056
Belgium    
Disclosure of Non Current Assets By Country [Line Items]    
Non-current assets 7,049 5,885
Germany    
Disclosure of Non Current Assets By Country [Line Items]    
Non-current assets 13,568 14,134
Other    
Disclosure of Non Current Assets By Country [Line Items]    
Non-current assets € 567 € 12