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Other gains and losses - Summary of Other gains and losses (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of Other gains and losses [Abstract]        
Foreign exchange (losses) gains, net $ 448,097   $ (89,152) $ (355,255)
Reimbursement of ADSs service charge 2,412   2,284 2,101
Gain (loss) on valuation of financial assets at fair value through profit or loss (69,404) $ (2,259) 15,262 24,015
Compensation income 174   1,524  
Others 5,288   4,253 5,872
Total $ 386,567 $ 12,579 $ (65,829) $ (323,267)