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Financial Risk management - Exposure to foreign exchange risk - Sensitivity Analysis (Details) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Fair value of financial assets € 102,972 € 120,417 € 39,545
Exposure to foreign exchange risk | USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible increase (decrease) in risk assumption 5.00%    
Cash and cash equivalents      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Fair value of financial assets € 86,553 € 105,687 € 35,840
Cash and cash equivalents | Exposure to foreign exchange risk | USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Fair value of financial assets 41,276    
Impact of a 5% change in fair value (1,966)    
Short-term deposit accounts      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Fair value of financial assets 8,829    
Short-term deposit accounts | Exposure to foreign exchange risk | USD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Fair value of financial assets 8,829    
Impact of a 5% change in fair value € (420)