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Financial liabilities - Disclosure of Maturity Analysis for Advances Loans and Lease Liabilities (Details) € in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 10, 2020 | Jun. 30, 2020 | Dec. 31, 2024 EUR (€) borrowing | Dec. 31, 2023 EUR (€)
Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Total |  |  | € 5,210 | € 5,113
Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Total |  |  | 24,689 | 28,358
Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Total |  |  | 41,725 | 19,274
More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Total |  |  | 39,412 | 51,867
Bpifrance | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 800 | 500
Bpifrance | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 837 | 1,637
Bpifrance | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Bpifrance | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Interest-free Bpifrance loan | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Interest-free Bpifrance loan | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Interest-free Bpifrance loan | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Interest-free Bpifrance loan | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Curadigm interest-free Bpifrance advance | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 100 | 100
Curadigm interest-free Bpifrance advance | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 200 | 200
Curadigm interest-free Bpifrance advance | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 75 | 175
Curadigm interest-free Bpifrance advance | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
HSBC "PGE" |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowing, deferment period |  | 1 year |  |
HSBC "PGE" | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 1,272 | 1,285
HSBC "PGE" | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 631 | 1,904
HSBC "PGE" | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
HSBC "PGE" | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Bpifrance "PGE" |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowing, maturity | 6 years |  |  |
Bpifrance "PGE" | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 1,289 | 1,317
Bpifrance "PGE" | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 948 | 2,237
Bpifrance "PGE" | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
Bpifrance "PGE" | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 0 | 0
EIB fixed rate loan | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 467 | 692
EIB fixed rate loan | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 19,942 | 19,946
EIB fixed rate loan | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 40,784 | 17,872
EIB fixed rate loan | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowings |  |  | 39,196 | 51,246
Lease liabilities | Less than 1 year |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Lease liabilities |  |  | 1,282 | 1,219
Lease liabilities | Between 1 and 3 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Lease liabilities |  |  | 2,131 | 2,434
Lease liabilities | Between 3 and 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Lease liabilities |  |  | 866 | 1,227
Lease liabilities | More than 5 years |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Lease liabilities |  |  | € 216 | € 621
HSBC "PGE" and Bpifrance "PGE" |  |  |  |
Summary of Maturity Analysis for Advances Loans and Lease Liabilities [Line Items] |  |  |  |
Borrowing, number of PGE | borrowing |  |  | 2 |
Borrowing, maturity |  |  | 5 years |
Borrowing, deferment period |  |  | 1 year |

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