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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash And Cash Equivalents [Abstract]      
Cash on hand € 881 € 188  
Bank accounts 47,306 39,611  
Total € 48,187 € 39,799 € 62,131