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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |
+ Proceeds from issue of share capital (net) | € 28,000 | € 27,972 | € 7 | € 126,486
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% |  |
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% |  |

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