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Employee Benefits - Additional Information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2022
EUR (€)
bond
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Jan. 01, 2020
EUR (€)
Disclosure of information about defined benefit plans [abstract]        
Defined contribution plan expense € 876 € 774 € 923  
Current provisions 61 313    
Provisions for employee benefits € 782 € 864    
Population Description Permanent staff      
Retirement age | bond 65      
Terms of retirement Initiated by the employee      
Life expectancy On the basis of the INSEE table (1)      
Probability of continued presence in the company at retirement age On the basis of the DARES table      
Disclosure of defined benefit plans [line items]        
Discount rate (as a percent) 3.25% 0.87%    
Increase in net defined benefit liability (asset) resulting from current service cost € 169 € 154    
Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) 8 5    
Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income 0 0    
Increase (decrease) in net defined benefit liability (asset) resulting from past service cost (258) (216)    
Increase (decrease) in net defined benefit liability (asset) resulting from service paid to employees 0 0    
Net defined benefit liability (asset) € 782 € 864   € 922
Changes in assumptions/discount rate (as a percent) 0.25%      
Impact/present value of the undertaking € (23)      
Percentage of reasonably possible decrease in actuarial assumption 0.25%      
Impact/present value of the undertaking € 24      
Within 1 Year        
Disclosure of defined benefit plans [line items]        
Salary growth rate (as a percent) 3.00% 3.00%    
Beyond        
Disclosure of defined benefit plans [line items]        
Salary growth rate (as a percent) 3.00% 3.00%    
2023        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable € 0      
2024        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable 0      
2025        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable 37      
2026        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable 21      
2027        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable 78      
Years 2028 and thereafter        
Disclosure of defined benefit plans [line items]        
Benefits paid or payable € 646