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Other gains and losses (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Other gains and losses
    
Year ended December 31,
  
    
2019
     
2020
     
2021
  
    
NT$000
     
NT$000
     
NT$000
  
Foreign exchange losses, net
      (154,993 )       (355,255 )       (89,152 ) 
Reimbursement of ADSs service charge
      4,292        2,101        2,284  
Gain on valuation of financial assets at fair value through profit or loss
      1,317        24,015        15,262  
Compensation income
      —          —          1,524  
Others
      970        5,872        4,253  
    
 
 
     
 
 
     
 
 
  
    
 
(148,414
) 
   
 
(323,267
) 
   
 
(65,829
)