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Other gains and losses - Summary of Other gains and losses (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of Other gains and losses [Abstract]        
Foreign exchange losses, net $ (89,152)   $ (355,255) $ (154,993)
Reimbursement of ADSs service charge 2,284   2,101 4,292
Gain on valuation of financial assets at fair value through profit or loss 15,262   24,015 1,317
Compensation income 1,524      
Others 4,253   5,872 970
Total $ (65,829) $ (2,373) $ (323,267) $ (148,414)