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Accounting principles - Disclosure of allocation of acquisition cost (Details) - Prosynergia - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Apr. 01, 2022
Nov. 25, 2021
Disclosure Of Detailed Information About Assets Acquisitions [Line Items]        
Cash prepayment made in 2021     € 325 € 325
Loan granted to Prosynergia in 2021     1,400  
Cash payment made in 2022     2,925  
Acquisition fees     466  
Earn-out measured at fair value     1,446  
Total acquisition cost allocated     6,562  
Patents     6,529  
Cash and cash equivalents     42  
Total assets     6,571  
Total liabilities     (9)  
Total net assets     € 6,562  
Payments for assets acquisition costs € 15 € 451