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Other gains and losses (Tables)
 12 Months Ended
Dec. 31, 2020
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Summary of Other gains and losses
                                                                                                
   
Year ended December 31,
 
   
2018
   
2019
  
2020
 
   
NT$000
   
NT$000
  
NT$000
 
Foreign exchange gains (losses), net
  
 
93,104
 
  
 
(154,993
) 
 
 
(355,255
) 
Reimbursement of ADSs service charge
  
 
13,269
 
  
 
4,292
 
 
 
2,101
 
Gain on valuation of financial assets at fair value through profit or loss
  
 
1,485
 
  
 
1,317
 
 
 
24,015
 
Others
  
 
6,851
 
  
 
970
 
 
 
5,872
 
  
 
 
   
 
 
  
 
 
 
  
 
114,709
 
  
 
(148,414
) 
 
 
(323,267
)