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Details of Significant Accounts - Share-based payment, schedule of movements of outstanding incentive stock option plan (Details)
shares in Thousands, Option in Thousands
 12 Months Ended
Dec. 31, 2023
Option
$ / shares
Dec. 31, 2022
Option
shares
$ / shares
No. of options    
Options exercisable at December 31 (in shares) | shares   0
Incentive Stock Option Plan    
No. of options    
Options outstanding at January 1 (in shares) 26,629 23,046
Options granted (in shares) 0 8,388
Options forfeited (in shares) 0 (1,681)
Options exercised (in shares) (26,629) (3,124)
Options outstanding at December 31 (in shares) 0 26,629
Options exercisable at December 31 (in shares) 0 26,629
Weighted-average exercise price    
Options outstanding at January 1 (in USD per share) | $ / shares $ 0.21 $ 0.18
Options granted (in USD per share) | $ / shares 0 0.27
Options forfeited (in USD per share) | $ / shares 0 0.22
Options exercised (in USD per share) | $ / shares 0.21 0.10
Options outstanding at December 31 (in USD per share) | $ / shares $ 0 $ 0.21