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Property and equipment - Disclosure of detailed information about property, plant and equipment (Details) - EUR (€) € in Thousands |  | 6 Months Ended
--- | --- | ---
Mar. 15, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period |  | € 6,322 | € 8,542
Acquisitions |  | 285 | 310
Disposals |  | (18) | (591)
Depreciation |  | (845) | (993)
Transfers |  | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | 5,748 | 7,268
Right-of-use assets |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period |  | 5,055 | 6,423
Acquisitions |  | 37 | 79
Disposals |  | (18) | (513)
Depreciation |  | (392) | (428)
Transfers |  | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | 4,682 | 5,561
Write-off of right-of-use asset | € 500 |  |
Lease liabilities – Building "Le Virage" |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Write-off of lease liability | € 700 |  |
Lands and buildings |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period |  | 2,958 | 4,242
Acquisitions |  | 15 | 31
Disposals |  | 0 | (513)
Depreciation |  | (352) | (323)
Transfers |  | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | 2,621 | 3,437
Laboratory equipment and other |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period |  | 3,378 | 4,298
Acquisitions |  | 267 | 279
Disposals |  | (18) | (78)
Depreciation |  | (493) | (670)
Transfers |  | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | 3,134 | 3,829
In progress |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Property, plant and equipment including right-of-use assets at beginning of period |  | 0 | 0
Acquisitions |  | 3 | 0
Disposals |  | 0 | 0
Depreciation |  | 0 | 0
Transfers |  | 0 | 0
Property, plant and equipment including right-of-use assets at end of period |  | € 3 | € 0

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