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Financial liabilities - Disclosure of reconciliation of liabilities arising from financing activities (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | € 74,466 | € 49,231 | € 51,653
Proceeds | 47,444 | 58,119 | 2,931
Repayments | (13,167) | (38,993) | (9,806)
Interest paid | (7,696) | (5,278) | (4,006)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | (3,204) |  |
Non-cash changes: (gain)/loss on recognition or derecognition | (590) |  |
Non-cash changes: interest expense and other | 15,834 | (1,046) | 6,983
Non-cash changes: recognition of earn-out liability |  | (1,005) | 1,446
Non-cash changes: amortized cost remeasurement | (3,404) |  |
Non-cash changes: fair value remeasurement | 1,367 | 3,027 | (1,446)
Non-cash changes : subsidies | (4,070) |  |
Non cash changes: additional leases | 2,221 | 272 | 1,476
Non cash changes : Effect of the change in foreign currency exhange rates | 17 |  |
Liabilities arising from financing activities at end of period | 109,218 | 74,466 | 49,231
Kreos 1 & 2 bond loans |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 12,982 | 21,110
Proceeds |  |  | 0
Repayments |  | (11,635) | (9,410)
Interest paid |  | (2,278) | (2,456)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  |  |
Non-cash changes: (gain)/loss on recognition or derecognition |  |  |
Non-cash changes: interest expense and other |  |  | 3,738
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement |  |  |
Non-cash changes: fair value remeasurement |  | 170 |
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases |  |  |
Non cash changes : Effect of the change in foreign currency exhange rates |  |  |
Liabilities arising from financing activities at end of period | 0 | 0 | 12,982
Oceane |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 19,957 | 18,816
Proceeds | 0 | 0 | 0
Repayments | 0 | (23,238) | 0
Interest paid | 0 | (1,602) | (1,496)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 0 | 0 | 2,636
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 3,069 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 0 | 0 | 19,957
Kreos / Claret convertible notes (OCABSA) |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 21,643 | 0 | 0
Proceeds | 0 | 23,119 | 0
Repayments | 0 | 0 | 0
Interest paid | (2,250) | (818) | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 3,977 | (1,046) | 0
Non-cash changes: recognition of earn-out liability |  | (1,005) | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 23,370 | 21,643 | 0
Kreos & Claret bond loans |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 0 | 0
Proceeds | 47,444 | 0 | 0
Repayments | 0 | 0 | 0
Interest paid | (3,639) | 0 | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | (3,204) |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 5,800 | 0 | 0
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 46,401 | 0 | 0
Heights convertible notes |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 29,605 | 0 | 0
Proceeds | 0 | 35,000 | 0
Repayments | (8,750) | (2,188) | 0
Interest paid | (1,772) | (525) | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | (590) |  |
Non-cash changes: interest expense and other | 1,714 | 0 | 0
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 1,367 | (212) | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 21,574 | 29,605 | 0
PGE |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 3,678 | 4,838 | 4,742
Proceeds | 0 | 0 | 0
Repayments | (1,250) | (1,250) | 0
Interest paid | (18) | (43) | (54)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 77 | 0 | 150
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 2,488 | 3,678 | 4,838
Conditional advances Bpifrance |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 6,771 | 6,783 | 6,770
Proceeds | 0 | 0 | 0
Repayments | (2,708) | (110) | (90)
Interest paid | 0 | 0 | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 7 | 0 | 102
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | (4,070) |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 0 | 6,771 | 6,783
Lease liabilities |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 540 | 1,384 | 214
Proceeds | 0 | 0 | 0
Repayments | (459) | (573) | (305)
Interest paid | (17) | (12) | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 61 | 0 | 0
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 2,221 | 272 | 1,476
Non cash changes : Effect of the change in foreign currency exhange rates | 17 |  |
Liabilities arising from financing activities at end of period | 2,363 | 540 | 1,384
Prosynergia earn-out liability |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 0 | 0
Proceeds | 0 | 0 | 0
Repayments | 0 | 0 | 0
Interest paid | 0 | 0 | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 0 | 0 | 0
Non-cash changes: recognition of earn-out liability |  | 0 | 1,446
Non-cash changes: amortized cost remeasurement | 0 |  |
Non-cash changes: fair value remeasurement | 0 | 0 | (1,446)
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | 0 | 0 | 0
Royalty certificates |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 12,229 | 3,287 | 0
Proceeds | 0 | 0 | 2,931
Repayments | 0 | 0 | 0
Interest paid | 0 | 0 | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments | 0 |  |
Non-cash changes: (gain)/loss on recognition or derecognition | 0 |  |
Non-cash changes: interest expense and other | 4,198 | 0 | 356
Non-cash changes: recognition of earn-out liability |  | 0 | 0
Non-cash changes: amortized cost remeasurement | (3,404) | 6,421 |
Non-cash changes: fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exhange rates | 0 |  |
Liabilities arising from financing activities at end of period | € 13,023 | € 12,229 | € 3,287

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