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Accounts receivable (Tables)
12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Accounts and notes receivable
 
  
December 31,
2019
 
  
December 31,

2020
 
 
  
NT$000
 
  
NT$000
 
Accounts receivable
  
 
4,454,255
 
  
 
5,365,776
 
Less: Loss allowance
  
 
(1,351
  
 
(1,620
 
  
 
 
 
  
 
 
 
 
  
 
4,452,904
 
  
 
5,364,156
 
 
  
 
 
 
  
 
 
 
Aging of Accounts Receivable which are Past Due but not Impaired
 
  
December 31,
2019
 
  
December 31,
2020
 
 
  
NT$000
 
  
NT$000
 
Current
  
 
4,440,081
 
  
 
5,272,208
 
Within 1 month
  
 
13,733
 
  
 
93,568
 
1 – 2 months
  
 
441
 
  
 
—  
 
 
  
 
 
 
  
 
 
 
 
  
 
4,454,255
 
  
 
5,365,776