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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]      
Cash on hand € 188 € 439  
Bank accounts 39,611 61,692  
Total € 39,799 € 62,131 € 55,035