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Financial liabilities - Schedule of Maturity Analysis for Advances Loans and Lease Liabilities (Details)
€ in Thousands
 6 Months Ended 12 Months Ended
Jul. 10, 2020
Jun. 30, 2025
EUR (€)
loan
Dec. 31, 2024
EUR (€)
loan
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Total   € 105,822 € 111,036
Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Total   4,831 5,210
Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Total   24,843 24,689
Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Total   45,781 41,725
More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Total   30,366 39,412
Bpifrance      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   1,037 1,637
Bpifrance | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   442 800
Bpifrance | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   595 837
Bpifrance | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
Bpifrance | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
Curadigm interest-free Bpifrance advance      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   325 375
Curadigm interest-free Bpifrance advance | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   100 100
Curadigm interest-free Bpifrance advance | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   200 200
Curadigm interest-free Bpifrance advance | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   25 75
Curadigm interest-free Bpifrance advance | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
HSBC "PGE"      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   1,266 1,903
HSBC "PGE" | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   1,266 1,272
HSBC "PGE" | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 631
HSBC "PGE" | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
HSBC "PGE" | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
Bpifrance "PGE"      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   1,589 2,237
Borrowing, maturity 6 years    
Bpifrance "PGE" | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   1,275 1,289
Bpifrance "PGE" | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   314 948
Bpifrance "PGE" | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
Bpifrance "PGE" | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   0 0
EIB fixed rate loan      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   97,751 100,389
EIB fixed rate loan | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   467 467
EIB fixed rate loan | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   22,027 19,942
EIB fixed rate loan | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   44,891 40,784
EIB fixed rate loan | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowings   30,366 39,196
Lease liabilities      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Lease liabilities   3,855 4,495
Lease liabilities | Less than 1 year      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Lease liabilities   1,282 1,282
Lease liabilities | Between 1 and 3 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Lease liabilities   1,707 2,131
Lease liabilities | Between 3 and 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Lease liabilities   866 866
Lease liabilities | More than 5 years      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Lease liabilities   € 0 € 216
HSBC "PGE" and Bpifrance "PGE"      
Summary of Maturity Analysis for Advances Loans and Lease Liabilities      
Borrowing, number of PGE | loan   2 2
Borrowing, maturity   5 years 5 years
Borrowing, deferment period   1 year 1 year