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Long-term bank loans (Tables)
 12 Months Ended
Dec. 31, 2020
Statement [LineItems]  
Summary of Bank Loans
Type of loans
  
Period and payment term
  
December 31,
2019
 
 
December 31,
2020
 
 
  
 
  
NT$000
 
 
NT$000
 
Syndicated bank loan
  
Borrowing period is from May 30, 2018 to May 30, 2023; interest is repayable monthly; principal is repayable semi-annually from November 30, 2018
  
 
9,066,000
 
 
 
3,310,000
 
Government granted bank loans
  
Borrowing period is from March 11, 2020 to February 15, 2030; interest is repayable monthly; principal is repayable monthly from March 15, 2023
  
 
—  
 
 
 
4,505,000
 
Less: Fee on syndicated bank loan
  
 
  
 
(24,355
) 
 
 
(17,223
) 
Less: Unamortized interest on government granted bank loans
  
 
  
 
—  
 
 
 
(64,212
) 
Less: Current portion (fee included)
  
 
  
 
(748,419
) 
 
 
(748,353
) 
 
  
 
  
 
 
 
 
 
 
 
 
  
 
  
 
8,293,226
 
 
 
6,985,212
 
 
  
 
  
 
 
 
 
 
 
 
Interest rate range
  
 
  
 
1.7895
% 
 
 
0.65%~1.7895
% 
 
  
 
  
 
 
 
 
 
 
 
Unused credit lines of long-term
NT$000
  
 
  
 
1,800,000
 
 
 
11,239,000