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Employee share scheme reserve - summary of exercise price and number of share options (Details)
 1 Months Ended 12 Months Ended
Jan. 25, 2023
Jan. 31, 2023
shares
$ / shares
Dec. 31, 2025
Options
shares
$ / shares
Dec. 31, 2024
shares
Options
$ / shares
Dec. 31, 2023
shares
Options
$ / shares
Employee share scheme reserve          
As of 1 January (share options) | Options     246,303 106,304  
As of 31 December (share options) | Options     296,304 246,303 106,304
Share split ratio   0.04      
Share options          
Employee share scheme reserve          
As of 1 January (share options) | shares   10,866,324 246,304 106,304 10,866,324
As of 1 January (Average exercise price per share option) | $ / shares   $ 3.554 $ 18.77 $ 40.33 $ 3.554
Reverse stock split effect (Average exercise price per share option) | $ / shares         $ 88.86
Reverse stock split effect (share options) | shares         434,203
Granted during the year (options) | shares     50,000 140,000 2,728
Granted during the year (Average exercise price per share option) | $ / shares     $ 0.01 $ 0.01 $ 162.5
Exercised during the year (Share option) | shares         (116,629)
Exercised during the year (Average exercise price per share option) | $ / shares         $ 0.001
Forfeited during the year (Share options) | shares         (213,998)
Forfeited during the year (Average exercise price per share option) | $ / shares         $ 162.3
As of 31 December (share options) | shares     296,304 246,304 106,304
As of 31 December (average exercise price per share option) | $ / shares     $ 15.6 $ 18.77 $ 40.33
As of 31 December reflecting reverse share split (share options) | shares         106,304
As of 31 December reflecting reverse share split (average exercise price per share option) | $ / shares         $ 40.33
Vested and exercisable (share options) | shares     168,179 126,304 105,529
Vested and exercisable (average exercise price per share option) | $ / shares     $ 18.23 $ 36.61 $ 38.79
Share split ratio 0.04   0.04 0.04 0.04