v3.26.1
Capital - Disclosure of Share Warrants and Non-employee Warrants (Detail)
12 Months Ended
Dec. 31, 2025
shares
€ / shares
Dec. 31, 2024
shares
Dec. 31, 2023
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding instruments as of 01/01/2025 13,367,451    
Number shares granted 6,421,033    
Number of options/warrants exercised (13,438)    
Number of free shares vested (231,992)    
Number of instruments voided (3,081,364)    
Number of outstanding instruments as of 12/31/2025 16,461,689 13,367,451  
Maximum of shares to be issued 16,981,708    
Number of exercisable warrants and stock options as of 12/31/2025 7,641,653    
Stock options [member] | 3/24/2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/24/2015    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,336,826    
Number of instruments voided (1,336,826)    
Number of outstanding instruments as of 12/31/2025   1,336,826  
Exercise price per option / warrant in Euros | € / shares € 38.45    
Stock options [member] | 9/8/2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 09/08/2015    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,301,000    
Number of instruments voided (1,301,000)    
Number of outstanding instruments as of 12/31/2025   1,301,000  
Exercise price per option / warrant in Euros | € / shares € 27.55    
Stock options [member] | 3/14/2016 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/14/2016    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,261,336    
Number of outstanding instruments as of 12/31/2025 1,261,336 1,261,336  
Maximum of shares to be issued 1,337,016    
Number of exercisable warrants and stock options as of 12/31/2025 1,261,336    
Exercise price per option / warrant in Euros | € / shares € 22.44    
Stock options [member] | 10/28/2016 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 10/28/2016    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,440,646    
Number of instruments voided (2,704)    
Number of outstanding instruments as of 12/31/2025 1,437,942 1,440,646  
Maximum of shares to be issued 1,524,220    
Number of exercisable warrants and stock options as of 12/31/2025 1,437,943    
Exercise price per option / warrant in Euros | € / shares € 17.9    
Stock options [member] | 10/11/2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 10/11/2017    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 665,000    
Number of outstanding instruments as of 12/31/2025 665,000 665,000  
Maximum of shares to be issued 704,900    
Number of exercisable warrants and stock options as of 12/31/2025 665,000    
Exercise price per option / warrant in Euros | € / shares € 22.57    
Stock options [member] | 10/08/2018 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 10/08/2018    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 5,000    
Number of outstanding instruments as of 12/31/2025 5,000 5,000  
Maximum of shares to be issued 5,300    
Number of exercisable warrants and stock options as of 12/31/2025 5,000    
Exercise price per option / warrant in Euros | € / shares € 24.8    
Stock options [member] | 04/24/2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 04/24/2019    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 904,291    
Number of instruments voided (10,500)    
Number of outstanding instruments as of 12/31/2025 893,791 904,291  
Maximum of shares to be issued 947,418    
Number of exercisable warrants and stock options as of 12/31/2025 893,791    
Exercise price per option / warrant in Euros | € / shares € 18.25    
Stock options [member] | 11/06/2019 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 11/06/2019    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 30,000    
Number of outstanding instruments as of 12/31/2025 30,000 30,000  
Maximum of shares to be issued 31,800    
Number of exercisable warrants and stock options as of 12/31/2025 30,000    
Exercise price per option / warrant in Euros | € / shares € 11.06    
Stock options [member] | 07/20/2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 07/20/2020    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 17,000    
Number of outstanding instruments as of 12/31/2025 17,000 17,000  
Maximum of shares to be issued 18,020    
Number of exercisable warrants and stock options as of 12/31/2025 17,000    
Exercise price per option / warrant in Euros | € / shares € 15.12    
Stock options [member] | 08/05/2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 08/05/2020    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 114,000    
Number of outstanding instruments as of 12/31/2025 114,000 114,000  
Maximum of shares to be issued 120,840    
Number of exercisable warrants and stock options as of 12/31/2025 114,000    
Exercise price per option / warrant in Euros | € / shares € 14.62    
Stock options [member] | 11/05/2020 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 11/05/2020    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 20,500    
Number of outstanding instruments as of 12/31/2025 20,500 20,500  
Maximum of shares to be issued 21,730    
Number of exercisable warrants and stock options as of 12/31/2025 20,500    
Exercise price per option / warrant in Euros | € / shares € 14.62    
Stock options [member] | 03/04/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/04/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 654,881    
Number of instruments voided (14,780)    
Number of outstanding instruments as of 12/31/2025 640,102 654,881  
Maximum of shares to be issued 678,508    
Number of exercisable warrants and stock options as of 12/31/2025 639,610    
Exercise price per option / warrant in Euros | € / shares € 19.44    
Stock options [member] | 04/13/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 04/13/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 27,465    
Number of outstanding instruments as of 12/31/2025 27,465 27,465  
Maximum of shares to be issued 29,113    
Number of exercisable warrants and stock options as of 12/31/2025 27,465    
Exercise price per option / warrant in Euros | € / shares € 16.07    
Stock options [member] | 05/12/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/12/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 2,844    
Number of instruments voided (2,844)    
Number of outstanding instruments as of 12/31/2025   2,844  
Exercise price per option / warrant in Euros | € / shares € 14.36    
Stock options [member] | 05/28/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/28/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 25,000    
Number of outstanding instruments as of 12/31/2025 25,000 25,000  
Maximum of shares to be issued 26,500    
Number of exercisable warrants and stock options as of 12/31/2025 25,000    
Exercise price per option / warrant in Euros | € / shares € 12.69    
Stock options [member] | 09/30/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 09/30/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 450    
Number of outstanding instruments as of 12/31/2025 450 450  
Maximum of shares to be issued 477    
Number of exercisable warrants and stock options as of 12/31/2025 450    
Exercise price per option / warrant in Euros | € / shares € 11.51    
Stock options [member] | 11/25/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 11/25/2021    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 3,094    
Number of instruments voided (3,094)    
Number of outstanding instruments as of 12/31/2025   3,094  
Exercise price per option / warrant in Euros | € / shares € 8.81    
Stock options [member] | 03/03/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/03/2022    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 499,045    
Number of outstanding instruments as of 12/31/2025 499,045 499,045  
Maximum of shares to be issued 528,988    
Number of exercisable warrants and stock options as of 12/31/2025 494,759    
Exercise price per option / warrant in Euros | € / shares € 4.41    
Stock options [member] | 03/29/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/29/2022    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 3,400    
Number of outstanding instruments as of 12/31/2025 3,400 3,400  
Maximum of shares to be issued 3,604    
Number of exercisable warrants and stock options as of 12/31/2025 3,188    
Exercise price per option / warrant in Euros | € / shares € 3.96    
Stock options [member] | 05/24/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/24/2022    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 37,580    
Number of outstanding instruments as of 12/31/2025 37,580 37,580  
Maximum of shares to be issued 39,835    
Number of exercisable warrants and stock options as of 12/31/2025 37,258    
Exercise price per option / warrant in Euros | € / shares € 3.48    
Stock options [member] | 12/19/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 12/19/2022    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,255    
Number of instruments voided (1,255)    
Number of outstanding instruments as of 12/31/2025   1,255  
Exercise price per option / warrant in Euros | € / shares € 2.09    
Stock options [member] | 01/24/2023 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 01/24/2023    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,084,941    
Number of outstanding instruments as of 12/31/2025 1,084,941 1,084,941  
Maximum of shares to be issued 1,150,037    
Number of exercisable warrants and stock options as of 12/31/2025 691,956    
Exercise price per option / warrant in Euros | € / shares € 3.17    
Stock options [member] | 05/04/2023 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/04/2023    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 355,650    
Number of options/warrants exercised (300)    
Number of outstanding instruments as of 12/31/2025 355,350 355,650  
Maximum of shares to be issued 376,671    
Number of exercisable warrants and stock options as of 12/31/2025 233,681    
Exercise price per option / warrant in Euros | € / shares € 1.8    
Stock options [member] | 06/26/2023 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 06/26/2023    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 46,753    
Number of options/warrants exercised (2,000)    
Number of instruments voided (2,656)    
Number of outstanding instruments as of 12/31/2025 42,096 46,753  
Maximum of shares to be issued 44,622    
Number of exercisable warrants and stock options as of 12/31/2025 26,088    
Exercise price per option / warrant in Euros | € / shares € 1.74    
Stock options [member] | 01/25/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 01/25/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 1,412,476    
Number of outstanding instruments as of 12/31/2025 1,412,476 1,412,476  
Maximum of shares to be issued 1,497,225    
Number of exercisable warrants and stock options as of 12/31/2025 466,117    
Exercise price per option / warrant in Euros | € / shares € 2.6    
Stock options [member] | 05/15/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/15/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 571,625    
Number of options/warrants exercised (2,742)    
Number of instruments voided (34,533)    
Number of outstanding instruments as of 12/31/2025 534,350 571,625  
Maximum of shares to be issued 534,350    
Number of exercisable warrants and stock options as of 12/31/2025 201,006    
Exercise price per option / warrant in Euros | € / shares € 2.82    
Stock options [member] | 06/26/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 06/26/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 556,562    
Number of options/warrants exercised (8,396)    
Number of instruments voided (2,530)    
Number of outstanding instruments as of 12/31/2025 545,636 556,562  
Maximum of shares to be issued 545,636    
Number of exercisable warrants and stock options as of 12/31/2025 190,537    
Exercise price per option / warrant in Euros | € / shares € 2.07    
Stock options [member] | 08/07/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 08/07/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 100,000    
Number of outstanding instruments as of 12/31/2025 100,000 100,000  
Maximum of shares to be issued 100,000    
Number of exercisable warrants and stock options as of 12/31/2025 33,000    
Exercise price per option / warrant in Euros | € / shares € 1.9    
Stock options [member] | 09/05/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 09/05/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 21,000    
Number of outstanding instruments as of 12/31/2025 21,000 21,000  
Maximum of shares to be issued 21,000    
Number of exercisable warrants and stock options as of 12/31/2025 6,563    
Exercise price per option / warrant in Euros | € / shares € 2.08    
Stock options [member] | 11/04/2024 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 11/04/2024    
Type Stock Options    
Number of outstanding instruments as of 01/01/2025 19,675    
Number of instruments voided (9,800)    
Number of outstanding instruments as of 12/31/2025 9,875 19,675  
Maximum of shares to be issued 9,875    
Number of exercisable warrants and stock options as of 12/31/2025 2,469    
Exercise price per option / warrant in Euros | € / shares € 1.7    
Stock options [member] | 1/30/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 01/30/2025    
Type Stock Options    
Number shares granted 3,851,783    
Number of outstanding instruments as of 12/31/2025 3,851,783    
Maximum of shares to be issued 3,851,783    
Exercise price per option / warrant in Euros | € / shares € 1.56    
Stock options [member] | 3/13/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/13/2025    
Type Stock Options    
Number shares granted 1,866,150    
Number of instruments voided (84,625)    
Number of outstanding instruments as of 12/31/2025 1,781,525    
Maximum of shares to be issued 1,781,525    
Exercise price per option / warrant in Euros | € / shares € 1.26    
Stock options [member] | 6/23/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 06/23/2025    
Type Stock Options    
Number shares granted 476,100    
Number of instruments voided (4,500)    
Number of outstanding instruments as of 12/31/2025 471,600    
Maximum of shares to be issued 471,600    
Exercise price per option / warrant in Euros | € / shares € 1.28    
Stock options [member] | 11/7/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 11/07/2025    
Type Stock Options    
Number shares granted 132,000    
Number of outstanding instruments as of 12/31/2025 132,000    
Maximum of shares to be issued 132,000    
Exercise price per option / warrant in Euros | € / shares € 3.07    
Stock options [member] | 12/9/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 12/09/2025    
Type Stock Options    
Number shares granted 20,000    
Number of outstanding instruments as of 12/31/2025 20,000    
Maximum of shares to be issued 20,000    
Exercise price per option / warrant in Euros | € / shares € 4.07    
Warrants [member] | 3/27/2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/27/2015    
Type Warrants    
Number of outstanding instruments as of 01/01/2025 50,000    
Number of instruments voided (50,000)    
Number of outstanding instruments as of 12/31/2025   50,000  
Exercise price per option / warrant in Euros | € / shares € 38.45    
Warrants [member] | 9/8/2015 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 09/08/2015    
Type Warrants    
Number of outstanding instruments as of 01/01/2025 74,200    
Number of instruments voided (74,200)    
Number of outstanding instruments as of 12/31/2025   74,200  
Exercise price per option / warrant in Euros | € / shares € 28.01    
Warrants [member] | 3/14/2016 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/14/2016    
Type Warrants    
Number of outstanding instruments as of 01/01/2025 66,675    
Number of instruments voided (40,175)    
Number of outstanding instruments as of 12/31/2025 26,500 66,675  
Maximum of shares to be issued 28,090    
Number of exercisable warrants and stock options as of 12/31/2025 26,500    
Exercise price per option / warrant in Euros | € / shares € 27.37    
Warrants [member] | 10/28/2016 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 10/28/2016    
Type Warrants    
Number of outstanding instruments as of 01/01/2025 68,000    
Number of instruments voided (40,000)    
Number of outstanding instruments as of 12/31/2025 28,000 68,000  
Maximum of shares to be issued 29,680    
Number of exercisable warrants and stock options as of 12/31/2025 28,000    
Exercise price per option / warrant in Euros | € / shares € 18.68    
Warrants [member] | 10/11/2017 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 10/11/2017    
Type Warrants    
Number of outstanding instruments as of 01/01/2025 80,000    
Number of instruments voided (40,000)    
Number of outstanding instruments as of 12/31/2025 40,000 80,000  
Maximum of shares to be issued 42,400    
Number of exercisable warrants and stock options as of 12/31/2025 40,000    
Exercise price per option / warrant in Euros | € / shares € 24.34    
Warrants [member] | 8/4/2025 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 08/04/2025    
Type Warrants    
Number shares granted 75,000    
Number of outstanding instruments as of 12/31/2025 75,000    
Maximum of shares to be issued 75,000    
Number of exercisable warrants and stock options as of 12/31/2025 23,438    
Exercise price per option / warrant in Euros | € / shares € 2.59    
Free Shares [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of outstanding instruments as of 01/01/2025 509,295 1,017,538 909,113
Number shares granted 0 0 342,900
Number of free shares vested (231,992) (342,675) (167,433)
Number of outstanding instruments as of 12/31/2025 251,946 509,295 1,017,538
Free Shares [member] | 03/05/2021 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/05/2021    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 788    
Number of instruments voided (788)    
Number of outstanding instruments as of 12/31/2025   788  
Free Shares [member] | 03/03/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/03/2022    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 192,480    
Number of free shares vested (192,728)    
Number of instruments voided 248    
Number of outstanding instruments as of 12/31/2025 0 192,480  
Maximum of shares to be issued 0    
Free Shares [member] | 03/29/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 03/29/2022    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 2,014    
Number of free shares vested (2,014)    
Number of outstanding instruments as of 12/31/2025   2,014  
Free Shares [member] | 05/24/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 05/24/2022    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 34,856    
Number of free shares vested (34,002)    
Number of instruments voided (854)    
Number of outstanding instruments as of 12/31/2025 0 34,856  
Maximum of shares to be issued 0    
Free Shares [member] | 12/19/2022 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 12/19/2022    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 1,606    
Number of free shares vested (636)    
Number of instruments voided (970)    
Number of outstanding instruments as of 12/31/2025   1,606  
Free Shares [member] | 01/24/2023 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Date 01/24/2023    
Type Free shares    
Number of outstanding instruments as of 01/01/2025 277,538    
Number of free shares vested (2,612)    
Number of instruments voided (22,980)    
Number of outstanding instruments as of 12/31/2025 251,946 277,538  
Maximum of shares to be issued 251,946