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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Cash € 33,610 € 54,475 € 53,472
Europe [member]      
Disclosure of geographical areas [line items]      
Cash 15,356 32,779  
Asia [member]      
Disclosure of geographical areas [line items]      
Cash 13,449 15,649  
North America [member]      
Disclosure of geographical areas [line items]      
Cash 3,659 4,482  
South America [member]      
Disclosure of geographical areas [line items]      
Cash 1,061 1,498  
Other [member]      
Disclosure of geographical areas [line items]      
Cash € 85 € 67