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Available-for-sale Financial Assets - 2017 (Tables)
 12 Months Ended
Dec. 31, 2018
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Summary of Available-for-sale Financial Assets
    December 31, 2017
    NT$
     
Unquoted ordinary shares   $ 605,110  
Quoted ordinary shares     279,791  
Limited partnership     246,072  
Unquoted preferred shares     57,367  
Open-end mutual funds     23,825  
      1,212,165  
Current     89,159  
         
Non-current   $ 1,123,006