v3.26.1
Share capital and share based payments - Disclosure of Number and Weighted Average Exercise Prices of Other Equity Instruments (Details)
 12 Months Ended
Jul. 25, 2025
shares
May 07, 2025
shares
Nov. 13, 2024
shares
Aug. 01, 2024
shares
Jun. 10, 2024
shares
Feb. 15, 2024
shares
Dec. 31, 2023
shares
employee
€ / shares
Dec. 21, 2023
shares
Apr. 14, 2023
shares
Dec. 16, 2022
shares
Dec. 12, 2022
shares
Oct. 03, 2022
shares
Feb. 14, 2022
shares
Oct. 01, 2021
shares
Jul. 22, 2021
shares
Aug. 05, 2020
shares
Jul. 03, 2019
shares
Apr. 29, 2019
shares
Jan. 14, 2019
shares
Apr. 03, 2018
shares
Sep. 20, 2017
shares
Dec. 30, 2016
shares
Oct. 21, 2016
shares
Jul. 01, 2015
shares
Apr. 27, 2015
shares
Jul. 16, 2014
shares
Jul. 17, 2013
shares
Dec. 31, 2025
shares
€ / shares
Dec. 31, 2024
shares
€ / shares
Dec. 31, 2023
shares
€ / shares
Warrants                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       16,173,374 15,872,874 12,820,670
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       6,448,557 3,632,005 3,057,735
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       5,890,199 4,368,529 3,271,690
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             6,491,245                                         3,834,618 7,872,340 6,491,245
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             7,242,172                                         4,561,680 8,621,332 7,242,172
BSAAR 2011                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       650,000 650,000 650,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       25,000 25,000 25,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       625,000 625,000 625,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 2.04                                         € 2.04 € 2.04 € 2.04
BSAAR 2012                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       146,050 146,050 146,050
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       12,250 12,250 12,250
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       133,800 133,800 133,800
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 2.04                                         € 2.04 € 2.04 € 2.04
BSAAR 2015                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                               1,050,382       1,050,382 1,050,382 1,050,382
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       1,048,442 2,720 2,720
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       1,940 1,940 1,940
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             1,045,722                                         0 1,045,722 1,045,722
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             1,045,722                                         0 1,045,722 1,045,722
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 7.20                                         € 7.20 € 7.20 € 7.20
AGAP Management 2016-1                                                             
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                             2,000         2,000 2,000 2,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       550 550 550
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       250 250 250
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             1,200                                         1,200 1,200 1,200
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             156,000                                         156,000 156,000 156,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Employees 2016-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                             2,486         2,486 2,486 2,486
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       251 251 251
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       357 187 172
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             2,063                                         1,878 2,048 2,063
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             268,190                                         244,140 266,240 268,190
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Management 2016-1                                                             
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                             50,000         50,000 50,000 50,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       50,000 50,000 50,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Management 2016-2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                             3,000         3,000 3,000 3,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             3,000                                         3,000 3,000 3,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             333,000                                         333,000 333,000 333,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Management 2016-2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                           250,000           250,000 250,000 250,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       250,000 250,000 250,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Employees 2017-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       5,725 5,725 5,725
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       5,725 5,725 5,725
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Management 2017-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       2,400 2,400 2,400
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       2,400 2,400 2,400
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Employee 2017                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                       28,556               114,500 114,500 114,500
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       4,000 4,000 4,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       110,500 110,500 110,500
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Bonus 2018-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                     90,650                 67,028 67,028 67,028
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       469 469 469
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       66,559 66,559 66,559
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Perf Employees 2018-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       327,500 327,500 327,500
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       224,375 224,375 224,375
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       103,125 103,125 103,125
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP Perf Management 2018-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       260,000 260,000 260,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       150,000 150,000 150,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       110,000 110,000 110,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Employees 2018                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       90,650 90,650 90,650
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       5,000 5,000 5,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       85,650 85,650 85,650
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA New Members 2017-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                   25,000                   25,000 25,000 25,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       25,000 25,000 25,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Bonus 2019-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                 57,376                     57,376 57,376 57,376
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       57,376 57,376 57,376
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP 2019 Employees 2019                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       546,700 546,700 546,700
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       375,150 375,150 375,150
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       171,550 171,550 171,550
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                           0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGAP 2019 Management 2019                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       355,000 355,000 355,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       207,500 207,500 207,500
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       147,500 147,500 147,500
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                           0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Bonus 2020-1 & 2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       79,861 79,861 79,861
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       17,885 17,885 17,885
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       61,976 61,976 61,976
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                           0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Employees 2020-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                               769,202                       766,650 766,650 766,650
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       681,420 681,420 681,420
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             85,230                                         85,230 85,230 85,230
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Management 2020-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                               710,000                       710,000 710,000 710,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       580,000 580,000 580,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             130,000                                         130,000 130,000 130,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Bonus 2021-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                             125,748                         125,748 125,748 125,748
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       125,748 125,748 125,748
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Employees 2021-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                           1,066,600                           1,066,600 1,066,600 1,066,600
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       454,520 454,520 247,300
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       612,080 612,080 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             819,300                                         0 0 819,300
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             819,300                                         0 0 819,300
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Management 2021-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                           610,000                           610,000 610,000 610,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       194,000 194,000 130,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       416,000 416,000 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             480,000                                         0 0 480,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             480,000                                         0 0 480,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA "Plan Epargne Entreprise" 2022                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                         138,960                             138,960 138,960 138,960
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       138,960 138,960 138,960
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Bonus 2022-1 [Member]                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                       128,061                               128,061 128,061 128,061
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       128,061 128,061 128,061
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Employees 2022-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                     1,371,500                                 1,371,500 1,371,500 1,371,500
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       400,000 299,000 198,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       971,500 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             1,173,500                                         0 1,072,500 1,173,500
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             1,173,500                                         0 1,072,500 1,173,500
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Management 2022-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                     550,000                                 550,000 550,000 550,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       550,000 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             550,000                                         0 550,000 550,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             550,000                                         0 550,000 550,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA "Plan Epargne Entreprise" 2023                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                 163,293                                     163,293 163,293 163,293
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       163,293 163,293 163,293
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA New Members 2023-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       25,000 25,000 25,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             25,000                                         25,000 25,000 25,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             25,000                                         25,000 25,000 25,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Employees 2023-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)               1,403,500                                       1,403,500 1,403,500 1,403,500
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       508,500 129,750 4,500
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             1,399,000                                         895,000 1,273,750 1,399,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             1,399,000                                         895,000 1,273,750 1,399,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA Perf Management 2023-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)               750,000                                       750,000 750,000 750,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       225,000 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             750,000                                         525,000 750,000 750,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             750,000                                         525,000 750,000 750,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
AGA New Members 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)           25,000                                           25,000 25,000  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       25,000 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 25,000 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       0 25,000  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA "Plan Epargne Entreprise" 2024                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)         68,744                                             68,744 68,744  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       68,744 68,744  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       0 0  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA Perf Management 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)       150,000                                               150,000 150,000  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         150,000 150,000 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       150,000 150,000  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA employees 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)     370,560                                                 370,560 370,560  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       93,480 1,800  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         277,080 368,760 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       277,080 368,760  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA Perf Employees 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)     1,162,900                                                 1,162,900 1,162,900  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       304,000 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         858,900 1,162,900 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       858,900 1,162,900  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA Perf Management 2024-2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)     975,000                                                 975,000 975,000  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       375,000 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         600,000 975,000 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       600,000 975,000  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA Management 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)     200,000                                                 200,000 200,000  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         200,000 200,000 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       200,000 200,000  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0 € 0  
AGA employees 2025-01                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)   220,500                                                   220,500    
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       56,200    
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0    
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       164,300    
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 0    
Stock Options 2020-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       102,000 102,000 102,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       102,000 102,000 102,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 0                                         € 0 € 0 € 0
Stock Options 2024-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       100,000 100,000  
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       100,000 0  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0  
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                                       0 100,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                                       0 100,000  
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 2.18 € 2.18  
BSA 2011-2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                       225,000 225,000 225,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       25,000 25,000 25,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       200,000 200,000 200,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 1.77                                         € 1.77 € 1.77 € 1.77
BSA 2013                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                     237,500 237,500 237,500 237,500
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       12,500 12,500 12,500
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       225,000 225,000 225,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         0 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         0 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 2.36                                         € 2.36 € 2.36 € 2.36
BSA 2014                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                   150,000   150,000 150,000 150,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       75,000 75,000 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       75,000 75,000 75,000
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             75,000                                         0 0 75,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             75,000                                         0 0 75,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 8.65                                         € 8.65 € 8.65 € 8.65
BSA 2015-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                                 70,000     70,000 70,000 70,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       70,000 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             70,000                                         0 70,000 70,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             70,000                                         0 70,000 70,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 9.59                                         € 9.59 € 9.59 € 9.59
BSA 2015-2                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                               14,200       14,200 14,200 14,200
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       14,200 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             14,200                                         0 14,200 14,200
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             14,200                                         0 14,200 14,200
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 14.05                                         € 14.05 € 14.05 € 14.05
BSA 2017                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                                         37,000             37,000 37,000 37,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             37,000                                         37,000 37,000 37,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             37,000                                         37,000 37,000 37,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 11.00                                         € 11.00 € 11.00 € 11.00
BSA 2022-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                   40,000                                   40,000 40,000 40,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       31,740 31,740 31,740
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             8,260                                         8,260 8,260 8,260
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             8,260                                         8,260 8,260 8,260
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 2.31                                         € 2.31 € 2.31 € 2.31
BSA 2023-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares)                   50,000                                   50,000 50,000 50,000
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       12,000 12,000 12,000
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0 0 0
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             38,000                                         38,000 38,000 38,000
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             38,000                                         38,000 38,000 38,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares             € 2.26                                         € 2.26 € 2.26 € 2.26
BSA-2025-1                                                            
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                                            
Number of free shares granted (in shares) 80,000                                                     80,000    
Number of other equity instruments forfeited in share-based payment arrangement (in shares)                                                       30,000    
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                                                       0    
Number of other equity instruments outstanding in share-based payment arrangement (in shares)             0                                         50,000 0 0
Number of other equity instruments exercisable in share-based payment arrangement (in shares)             0                                         50,000 0 0
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement (in EUR per share) | € / shares                                                       € 1.62