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Significant commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Future Minimum Lease Obligation Payable under Operating Lease Contracts
Future minimum lease obligation payable under those leases are as follows:
 
   
December 31,
2018
 
   
NT$000
 
Within 1 year
   68,631 
1 to 5 years
   140,137 
Over 5 years
   111,446 
  
 
 
 
  
 
320,214
 
  
 
 
 
Capital Expenditures that are Contracted for, but not Provided for
Capital expenditures that are contracted for, but not provided for are as follows:
 
   
December 31,
2018
   
December 31,
2019
 
   
NT$000
   
NT$000
 
Property, plant and equipment
   2,508,797    1,640,712