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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Inventories
    December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Finished goods   $ 6,740,816     $ 7,680,083     $ 250,901  
Work in process     3,452,332       3,195,478       104,393  
Raw materials     12,625,502       23,250,801       759,582  
Supplies     894,196       1,892,194       61,816  
Raw materials and supplies in transit     548,065       608,895       19,892  
    $ 24,260,911     $ 36,627,451     $ 1,196,584