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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | € 109,218 | € 74,466 | € 49,231
Proceeds | 0 | 47,444 | 58,119
Repayments | (59,532) | (13,167) | (38,993)
Interest paid | (6,491) | (7,696) | (5,278)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | (3,204) | (1,046)
Non-cash changes: (gain)/loss on recognition or derecognition | 2,281 | (590) | 3,027
Non-cash changes: interest expense and other | 17,200 | 15,834 | 7,459
Non-cash changes: recognition of earn-out liability |  |  | (1,005)
Non-cash changes: amortized cost remeasurement | 11,278 | (3,404) | 5,878
Non-cash changes: other fair value remeasurement | 36,002 | 1,367 | (3,198)
Non-cash changes : subsidies |  | (4,070) |
Non-cash changes: conversion into shares | (78,275) |  |
Non cash changes: additional leases | 444 | 2,221 | 272
Non cash changes : Effect of the change in foreign currency exchange rates | (33) | 17 |
Liabilities arising from financing activities at end of period | 32,093 | 109,218 | 74,466
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 | 0 | 12,982
Proceeds | 0 | 0 | 0
Repayments | 0 | 0 | (11,635)
Interest paid | 0 | 0 | (2,278)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 170
Non-cash changes: interest expense and other | 0 | 0 | 760
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 0 | 0
OCEANE |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 0 | 19,957
Proceeds | 0 | 0 | 0
Repayments | 0 | 0 | (23,238)
Interest paid | 0 | 0 | (1,602)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 3,069
Non-cash changes: interest expense and other | 0 | 0 | 1,814
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 0 | 0
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 | 23,370 | 21,643 | 0
Proceeds | 0 | 0 | 23,119
Repayments | 0 | 0 | 0
Interest paid | (1,875) | (2,250) | (818)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | (1,046)
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 0
Non-cash changes: interest expense and other | 2,860 | 3,977 | 1,393
Non-cash changes: recognition of earn-out liability |  |  | (1,005)
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | (24,354) |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 23,370 | 21,643
Kreos & Claret bond loans |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 46,401 | 0 | 0
Proceeds | 0 | 47,444 | 0
Repayments | (53,920) | 0 | 0
Interest paid | (3,791) | (3,639) | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | (3,204) | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 3,838 | 0 | 0
Non-cash changes: interest expense and other | 7,472 | 5,800 | 0
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 46,401 | 0
Heights convertible notes |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 21,574 | 29,605 | 0
Proceeds | 0 | 0 | 35,000
Repayments | (2,188) | (8,750) | (2,188)
Interest paid | (689) | (1,772) | (525)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | (1,557) | (590) | (212)
Non-cash changes: interest expense and other | 778 | 1,714 | 727
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 36,002 | 1,367 | (3,198)
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | (53,921) |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 21,574 | 29,605
PGE |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 2,488 | 3,678 | 4,838
Proceeds | 0 | 0 | 0
Repayments | (2,514) | (1,250) | (1,250)
Interest paid | (72) | (18) | (43)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 0
Non-cash changes: interest expense and other | 99 | 77 | 133
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 2,488 | 3,678
Conditional advances Bpifrance |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 0 | 6,771 | 6,783
Proceeds | 0 | 0 | 0
Repayments | 0 | (2,708) | (110)
Interest paid | 0 | 0 | 0
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 0
Non-cash changes: interest expense and other | 0 | 7 | 98
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 0 | 0 | 0
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | (4,070) |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | 0 | 0 | 6,771
Lease liabilities |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 2,363 | 540 | 1,384
Proceeds | 0 | 0 | 0
Repayments | (910) | (459) | (573)
Interest paid | (64) | (17) | (12)
Non-cash changes: classification of embedded derivatives as separate derivative financial instruments |  | 0 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 0
Non-cash changes: interest expense and other | 64 | 61 | 12
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | (7) | 0 | (543)
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 444 | 2,221 | 272
Non cash changes : Effect of the change in foreign currency exchange rates | (33) | 17 |
Liabilities arising from financing activities at end of period | 1,856 | 2,363 | 540
Royalty certificates |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Liabilities arising from financing activities at beginning of period | 13,023 | 12,229 | 3,287
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 | 0
Non-cash changes: (gain)/loss on recognition or derecognition | 0 | 0 | 0
Non-cash changes: interest expense and other | 5,927 | 4,198 | 2,521
Non-cash changes: recognition of earn-out liability |  |  | 0
Non-cash changes: amortized cost remeasurement | 11,286 | (3,404) | 6,421
Non-cash changes: other fair value remeasurement | 0 | 0 | 0
Non-cash changes : subsidies |  | 0 |
Non-cash changes: conversion into shares | 0 |  |
Non cash changes: additional leases | 0 | 0 | 0
Non cash changes : Effect of the change in foreign currency exchange rates | 0 | 0 |
Liabilities arising from financing activities at end of period | € 30,237 | € 13,023 | € 12,229

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