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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]      
Cash € 54,475 € 53,472 € 48,187
Europe [member]      
Disclosure of geographical areas [line items]      
Cash 32,779 36,550  
China [member]      
Disclosure of geographical areas [line items]      
Cash 15,355 9,938  
North America [member]      
Disclosure of geographical areas [line items]      
Cash 4,482 5,924  
South America [member]      
Disclosure of geographical areas [line items]      
Cash 1,498 786  
Other [member]      
Disclosure of geographical areas [line items]      
Cash € 361 € 274