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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents [abstract]      
Cash on hand € 125 € 89  
Bank accounts 33,485 54,386  
Total € 33,610 € 54,475 € 53,472