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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Cash and Cash Equivalents
                                                       
    
December 31,

2020
     
December 31,

2021
  
    
NT$000
     
NT$000
  
Cash on hand and petty cash
   
 
470
 
   
 
450
 
Checking accounts and demand deposits
   
 
2,609,421
 
   
 
2,683,977
 
Time deposits
   
 
1,503,760
 
   
 
3,221,749
 
    
 
 
     
 
 
  
    
 
4,113,651
 
   
 
5,906,176
 
    
 
 
     
 
 
  
 
  a)
The Group transacts with a variety of financial institutions all with high credit quality to disperse credit risk, so it expects that the probability of counterparty default is remote.
 
  b)
No cash and cash equivalents of the Group were pledged to others.