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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Cash and Cash Equivalents
 
  
December 31,

2018
 
  
December 31,
2019
 
 
  
NT$000
 
  
NT$000
 
Cash on hand and petty cash
  
 
470
 
  
 
470
 
Checking accounts and demand deposits
  
 
1,396,302
 
  
 
915,134
 
Time deposits
  
 
3,245,750
 
  
 
3,788,480
 
 
  
 
 
 
  
 
 
 
 
  
 
4,642,522
 
  
 
4,704,084