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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash And Cash Equivalents [Abstract]      
Cash on hand € 201 € 881  
Bank accounts 53,271 47,306  
Total € 53,472 € 48,187 € 39,799