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Inventories
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Inventories
 
10.
Inventories
 
    
December 31, 2020
  
    
Cost
     
Allowance for

impairment losses
     
Carrying amount
  
    
NT$000
     
NT$000
     
NT$000
  
Raw materials
   
 
2,181,890
 
   
 
(79,815
) 
   
 
2,102,075
 
    
 
 
     
 
 
     
 
 
  
 
    
December 31, 2021
  
    
Cost
     
Allowance for

impairment losses
     
Carrying amount
  
    
NT$000
     
NT$000
     
NT$000
  
Raw materials
   
 
3,328,763
 
   
 
(121,586
) 
   
 
3,207,177
 
    
 
 
     
 
 
     
 
 
  
The cost of inventories recognized as an expense for the year:
 
    
Year ended December 31,
  
    
2019
     
2020
     
2021
  
    
NT$000
     
NT$000
     
NT$000
  
Cost of revenue
      16,372,032        17,957,568        20,103,735  
Loss on abandonment
      12,369        5,323        552  
Allowance for inventory valuation and obsolescence loss
      27,341        16,317        41,770  
    
 
 
     
 
 
     
 
 
  
    
 
16,411,742
 
   
 
17,979,208
 
   
 
20,146,057
 
    
 
 
     
 
 
     
 
 
  
 
  a)
Allowance for inventory valuation and obsolescence loss was recognized due to the change in net realizable value.
 
  b)
No inventories of the Group were pledged to others.