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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