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Income Tax - Narrative (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 25, 2021
Mar. 31, 2020
Jan. 01, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Other current tax liabilities € 5,051 € 0 € 0      
+ Income tax expense (benefit) 2,215 (428) (576)      
Deferred tax liabilities 602 767 1,193      
Tax loss carry forwards (450,679) (483,356) (384,471)      
Taxable profit limit € 1,000          
Percentage of profit exceeding limit offsetting taxable profit 50.00%          
Tax loss carried forward used to offset taxable profits € 33,700          
Deferred tax liabilities 2,314 2,050 3,182     € 2,049
Deferred tax assets 1,712 1,282 1,988      
Tax losses for the period, unrecognised as deferred tax assets 0 28,603 25,274      
Temporary difference from postemployments            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Temporary differences € 216 € 287 352      
OCEANE            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liabilities       € 4,400 € 2,000  
Temporary differences     € 1,193