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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents by Geographic Area (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of geographical areas [line items]      
Cash € 53,472 € 48,187 € 39,799
Europe [member]      
Disclosure of geographical areas [line items]      
Cash 36,550 38,773  
China [member]      
Disclosure of geographical areas [line items]      
Cash 9,938 6,040  
North America [member]      
Disclosure of geographical areas [line items]      
Cash 5,924 2,725  
South America [member]      
Disclosure of geographical areas [line items]      
Cash 786 533  
Other [member]      
Disclosure of geographical areas [line items]      
Cash € 274 € 116