Related Parties - Additional Information (Details) € in Thousands	12 Months Ended
	Dec. 31, 2020 EUR (€) Employee Co-founder
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
Percentage of share capital held by related party	4.86%
The NASH Epidemiology Institute TM
Disclosure Of Transactions Between Related Parties [Line Items]
Endowment fund balance	€ 17
PCAS Group
Disclosure Of Transactions Between Related Parties [Line Items]
Technology transfers cost	€ 255