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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Details)
€ in Thousands, $ in Thousands
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Cash and cash equivalent [line items]              
Short-term deposits € 69,045   € 166,034   € 263,147    
Cash on hand and bank accounts 189,711   4,995   13,601    
TOTAL 258,756 $ 81,713 171,029 $ 111,221 276,748 $ 153,438 € 207,240
UCITS              
Cash and cash equivalent [line items]              
Short-term deposits 0   2,060   3,096    
TERM ACCOUNTS              
Cash and cash equivalent [line items]              
Short-term deposits 69,045   143,827   215,018    
INTEREST-BEARING CURRENT ACCOUNT              
Cash and cash equivalent [line items]              
Short-term deposits € 0   € 20,147   € 45,033