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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Cash and Cash Equivalents
    December 31
    2016   2017
    NT$   NT$   US$ (Note 4)
             
Cash on hand   $ 6,856     $ 8,404     $ 284  
Checking accounts and demand deposits     28,823,763       39,697,319       1,339,316  
Cash equivalents     9,561,905       6,372,343       214,991  
                         
    $ 38,392,524     $ 46,078,066     $ 1,554,591