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Details of Significant Accounts - Income tax, schedule of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income tax:      
Current tax expense recognized for the current period $ 144 $ 390 $ 300
Prior year income tax underestimation 0 3 9
Total current tax 144 393 309
Deferred income tax:      
Origination and reversal of temporary differences (29) (101) (47)
Taxable losses 0 0 155
Total deferred income tax (29) (101) 108
Income tax expense $ 115 $ 292 $ 417