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Inventories
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Inventories
17.
Inventories
 
   
December 31, 2018
 
   
Cost
   
Allowance for
impairment losses
   
Carrying
amount
 
   
NT$000
   
NT$000
   
NT$000
 
Raw materials
  
 
1,814,992
 
  
 
(36,157
) 
  
 
1,778,835
 
  
 
 
   
 
 
   
 
 
 
 
   
December 31, 2019
 
   
Cost
   
Allowance for
impairment losses
   
Carrying
amount
 
   
NT$000
   
NT$000
   
NT$000
 
Raw materials
  
 
1,831,140
 
  
 
(63,498
) 
  
 
1,767,642
 
  
 
 
   
 
 
   
 
 
 
 
The cost of inventories recognized as an expense for the year:
 
   
2018
   
2019
 
   
NT$000
   
NT$000
 
Cost of revenue
   15,057,605    16,372,032 
Loss on abandonment
   5,497    12,369 
Allowance for (reversal of) inventory valuation and obsolescence loss
   (13,070)    27,341 
  
 
 
   
 
 
 
  
 
15,050,032
 
  
 
16,411,742
 
  
 
 
   
 
 
 
 
 a)
Reversal of allowance for inventory valuation and obsolescence loss was recognized due to the change in net realizable market value.
 
 b)
No inventories of the Group were pledged to others.