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Related Parties - Additional Information (Details) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 Co-founder employee | Dec. 31, 2020 EUR (€)
Biotech Avenir SAS |  |
Disclosure of transactions between related parties [line items] |  |
Number of co-founders hold share capital of related party | Co-founder | 4 |
Number of employees hold share capital of related party | employee | 12 |
Biotech Avenir SAS | Genfit |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate (as a percent) | 3.79% |
The NASH Epidemiology Institute TM |  |
Disclosure of transactions between related parties [line items] |  |
Endowment fund balance |  | € 17
Associates [member] | PCAS Group |  |
Disclosure of transactions between related parties [line items] |  |
Technology transfers cost |  | € 255

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