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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2018
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Summary of Cash and Cash Equivalents
    December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Cash on hand   $ 8,404     $ 7,940     $ 259  
Checking accounts and demand deposits     39,697,319       32,329,820       1,056,185  
Cash equivalents     6,372,343       19,180,676       626,615  
                         
    $ 46,078,066     $ 51,518,436     $ 1,683,059