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Revenues and other income - Schedule of Revenues and Other Income (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues € 10 € 50 € 68
Research tax credit 2,490 1,927 2,437
Subsidies 126 526 20
Other 21 10 17
Other income 2,637 2,462 2,473
Total revenues and other income 2,647 2,512 2,541
Services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 5 50 40
Other sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues € 5 € 0 € 28