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Financial Risks Management - Additional Information (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 16, 2017
Foreign Exchange Rates [Line Items]        
Cash and cash equivalents and other financial assets € 172,486 € 278,474 € 208,553  
OCEANEs        
Foreign Exchange Rates [Line Items]        
Aggregate nominal amount € 180,000     € 180,000
Debt maturity date October 16, 2022      
Interest Rate Risk        
Foreign Exchange Rates [Line Items]        
Financial liabilities € 185,691 € 183,619 € 169,593