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Other gains and losses - Summary of Other gains and losses (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of Other gains and losses [Abstract]        
Foreign exchange (losses) gains, net $ 78,170   $ 448,097 $ (89,152)
Gain (loss) on valuation of financial assets at fair value through profit or loss 39,254 $ 1,282 (69,404) 15,262
Reimbursement of ADSs service charge 2,121   2,412 2,284
Compensation income 20   174 1,524
Others 15,936   5,288 4,253
Total $ 135,501 $ 4,425 $ 386,567 $ (65,829)