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Major Events in the Period and Events After the Period - Signature of a Licensing and Partnership Agreement with Ipsen (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 22, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Major Events In The Period And Events After The Period [Line Items]        
New shares created (in shares)   49,834,983 49,815,489  
+ Proceeds from issue of share capital (net) € 28,000 € 5 € 27,972 € 7
Genfit | Ipsen        
Disclosure Of Major Events In The Period And Events After The Period [Line Items]        
Proportion of ownership interest in associate (as a percent)   8.00% 8.00%  
Ipsen        
Disclosure Of Major Events In The Period And Events After The Period [Line Items]        
Payment from collaboration, up-front cash payment, VAT     € 24,000  
+ Proceeds from issue of share capital (net)   € 28,000    
Ipsen | Collaboration and License Agreement        
Disclosure Of Major Events In The Period And Events After The Period [Line Items]        
Revenue from collaboration, potential milestone payments     € 360,000  
Royalty income, percent of collaborative sales     20.00%