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Financial liabilities - Disclosure of Changes in Liabilities Arising from Financing Activities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Interest paid € (980) € (6,978) € (915)
Payment of lease liabilities (1,080) (794) (1,093)
Cash flows from financing activities (5,135) 46,771 (5,651)
Liabilities Related To Financing Activities      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 50,565 53,168  
Principal received 0 150  
Decrease in loans and conditional advances (3,075) (2,971)  
Interest paid (810) (6,775)  
Interest paid (IFRS 16) (170) (203)  
Payment of lease liabilities (1,080) (793)  
Cash flows from financing activities (5,136) (10,592)  
Indexation effect on current lease commitment 245 376  
Impact of discounting and catch-up (2,833) (335)  
Accumulated fixed interest expense accrual 1,808 2,550  
Accumulated variable interest expense accrual 6,254 5,396  
Non-cash from financing activities 5,474 7,988  
Liabilities arising from financing activities at end of period 50,902 50,565 53,168
Lease liabilities      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 5,081 5,530  
Interest paid (IFRS 16) (170) (203)  
Payment of lease liabilities (1,080) (793)  
Early termination of lease contracts 0 0  
Cash flows from financing activities (1,250) (996)  
Indexation effect on current lease commitment 245 376  
Impact of discounting and catch-up (16) (31)  
Accumulated variable interest expense accrual 169 201  
Non-cash from financing activities 398 547  
Liabilities arising from financing activities at end of period 4,230 5,081 5,530
Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 6,612 9,127  
Principal received 0 0  
Accumulated fixed interest expense accrual 97 131  
Liabilities arising from financing activities at end of period 4,089 6,612 9,127
Bpifrance advance | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 2,066 2,316  
Decrease in loans and conditional advances (500) (300)  
Cash flows from financing activities (500) (300)  
Impact of discounting and catch-up 12 16  
Accumulated fixed interest expense accrual 28 34  
Non-cash from financing activities 40 50  
Liabilities arising from financing activities at end of period 1,606 2,066 2,316
Interest-free Bpifrance loan | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period   125  
Decrease in loans and conditional advances   (125)  
Cash flows from financing activities   (125)  
Liabilities arising from financing activities at end of period     125
Curadigm Bpifrance advance | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 397 317  
Principal received 0 150  
Decrease in loans and conditional advances (75) (50)  
Cash flows from financing activities (75) 100  
Impact of discounting and catch-up 20 (20)  
Non-cash from financing activities 20 (20)  
Liabilities arising from financing activities at end of period 342 397 317
EIB fixed rate loan | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 36,409 35,754  
Interest paid (697) (6,639)  
Cash flows from financing activities (697) (6,639)  
Impact of discounting and catch-up (2,832) (285)  
Accumulated fixed interest expense accrual 1,670 2,385  
Accumulated variable interest expense accrual 6,085 5,195  
Non-cash from financing activities 4,923 7,295  
Liabilities arising from financing activities at end of period 40,635 36,409 35,754
HSBC “PGE” | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 3,155 4,409  
Principal received 0 0  
Decrease in loans and conditional advances (1,250) (1,246)  
Interest paid (48) (41)  
Cash flows from financing activities (1,298) (1,287)  
Impact of discounting and catch-up (13) (9)  
Accumulated fixed interest expense accrual 48 41  
Non-cash from financing activities 35 32  
Liabilities arising from financing activities at end of period 1,891 3,155 4,409
Bpifrance “PGE” | Long-term borrowings      
Disclosure Of Detailed Information About Financial Liabilities [Line Items]      
Liabilities arising from financing activities at beginning of period 3,457 4,717  
Principal received 0 0  
Decrease in loans and conditional advances (1,250) (1,250)  
Interest paid (66) (95)  
Cash flows from financing activities (1,316) (1,345)  
Impact of discounting and catch-up (4) (6)  
Accumulated fixed interest expense accrual 62 90  
Non-cash from financing activities 58 84  
Liabilities arising from financing activities at end of period € 2,198 € 3,457 € 4,717