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Investments accounted for using equity method (Tables)
12 Months Ended
Dec. 31, 2021
Investments accounted for using equity method [abstract]  
Details of Investment in Associates
Associates                                                                              
  
December 31,
2020
    
December 31,
2021
 
    
NT$000
    
NT$000
 
JMC ELECTRONICS CO., LTD. (“JMC”)
     250,769        304,437  
Unimos Microelectronics (Shanghai) Co., Ltd.
(“Unimos Shanghai”)
     3,020,908        3,596,012  
    
 
 
    
 
 
 
    
 
3,271,677
 
  
 
3,900,449
 
    
 
 
    
 
 
 
Summarized Financial Information for Investment in Material Associates
 
    
Year ended December 31,
 
    
2019
    
2020
    
2021
 
    
NT$000
    
NT$000
    
NT$000
 
(Loss) profit for the year from continuing operations
     (154,926      (147,329      625,733  
Other comprehensive income, net of income tax
     5,732        23,143        28,843  
    
 
 
    
 
 
    
 
 
 
Total comprehensive (loss) income
  
 
(149,194
  
 
(124,186
  
 
654,576