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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Cash and cash equivalents [abstract]      
Cash on hand € 439 € 219 € 100
Bank accounts 61,692 54,816 64,881
Total € 62,131 € 55,035 € 64,981