v3.26.1
Basis of preparation (Details) - EUR (€)
€ in Thousands
1 Months Ended 3 Months Ended 148 Months Ended
Jul. 31, 2025
Jun. 30, 2025
Oct. 31, 2023
Feb. 28, 2023
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Disclosure of non-adjusting events after reporting period [line items]              
Net loss for the period         € (48,468) € (52,370)  
Capital increases             € 1,194,700
Proceeds from borrowings             175,000
Proceeds from research tax credit   € 5,640         41,300
Repayment of PGE             2,900
Cash and cash equivalents and other short-term investments         € 491,600   491,600
Conditional advances Bpifrance              
Disclosure of non-adjusting events after reporting period [line items]              
Proceeds from government grants             17,100
Repayments of conditional advances             € 1,800
Registered direct offering              
Disclosure of non-adjusting events after reporting period [line items]              
Capital increases € 637,500   € 223,300 € 130,000