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Goodwill and impairment test (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of information for cash-generating units [line items]      
Goodwill € 18,419 € 18,419 € 32,005
Discount rate (WACC) 15.00% 14.00% 13.50%
Impairment loss recognised in profit or loss, intangible assets and goodwill € 0 € 13,632 € 0
Splicos SAS      
Disclosure of information for cash-generating units [line items]      
Goodwill     18,419
Wittycel SAS      
Disclosure of information for cash-generating units [line items]      
Goodwill     13,586
Impairment loss recognised in profit or loss, intangible assets and goodwill   13,632  
Impairment loss recognised in profit or loss, goodwill   13,586  
Impairment loss recognised in profit or loss, other intangible assets € 0 45 € 0
Intangible assets with indefinite useful life   € 0  
Increase in discount rate, percentage points     3.7
Decrease in revenue, percentage     22.00%
Decrease in POS per share, percentage     10.00%