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Financial liabilities - Narrative (Details)
€ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 10, 2020
EUR (€)
quarterly_installment
Jun. 30, 2020
EUR (€)
Jun. 30, 2025
EUR (€)
Jun. 30, 2024
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2024
EUR (€)
Oct. 12, 2023
EUR (€)
Jul. 31, 2018
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Repayments of borrowings, classified as financing activities     € 1,926 € 1,525        
Increase in loans and conditional advances     0 0        
Interest costs     4,174 3,772        
HSBC “PGE”                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Notional amount   € 5,000            
Borrowing, interest rate   0.31%            
Repayments of borrowings, classified as financing activities       600        
Bpifrance “PGE”                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Notional amount   € 5,000            
Borrowing, interest rate 2.25%              
Repayments of borrowings, classified as financing activities     600          
Increase in loans and conditional advances € 5,000              
Borrowing, maturity 6 years              
Percentage of state-guaranteed loan 0.90              
Borrowing, guarantee fee 1.61%              
Number of quarterly instalments | quarterly_installment 20              
EIB Loan                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Notional amount     43,500     € 40,600    
Borrowing, interest rate               21.30%
Repayments of borrowings, classified as financing activities     200          
Increase in outstanding loans     2,800          
Interest costs     4,100          
Impact of accretion and discounting     1,000 2,700        
Adjustment to debt financing related to estimated debt outflows     2,400 10,800        
Increase (decrease) related to adjustments for income forecast projections     € 1,400 € 13,500        
Market rate estimated percent     19.20%          
Borrowings     € 97,800          
Borrowings, cumulative milestone prepayment amount             € 100,000  
Estimated royalty payments     € 45,100          
Consolidated forecasted sales, period     6 years          
EIB Loan | Principal and Fixed Rate                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Borrowings     € 33,700          
EIB Loan | Milestone Payment                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Borrowings     19,000          
EIB Loan | At fair value                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Notional amount     € 46,500          
Banque Publique d’Investissement                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Advances, interest rate         1.56%      
Repayments of current borrowings         € 600      
Reimbursed amount of corresponds         € 1,000      
Bpifrance                
Disclosure Of Detailed Information About Financial Liabilities [Line Items]                
Repayments of current borrowings   100            
Reimbursed amount of corresponds   300            
Authorized amount to be advanced   500            
Advances received   € 400