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Inventories
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Inventories
11.
INVENTORIES
 
 
 
December 31
 
 
2018
 
2019
 
 
NT$
 
NT$
 
US$ (Note 4)
 
 
 
 
 
 
 
Finished goods
 
$
7,680,083
 
 
$
7,174,716
 
 
$
239,877
 
Work in process
 
 
3,195,478
 
 
 
2,952,182
 
 
 
98,702
 
Raw materials
 
 
23,250,801
 
 
 
20,996,346
 
 
 
701,984
 
Supplies
 
 
1,892,194
 
 
 
2,229,576
 
 
 
74,543
 
Raw materials and supplies in transit
 
 
608,895
 
 
 
530,930
 
 
 
17,751
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
36,627,451
 
 
$
33,883,750
 
 
$
1,132,857
 
 
The cost of inventories recognized as operating costs for the years ended December 31, 2017, 2018 and 2019 were NT$237,193,286 thousand, NT$309,020,850 thousand and NT$347,877,603 thousand (US$11,630,813 thousand), respectively, which included write-downs of inventories at NT$398,824 thousand, NT$980,927 thousand and NT$452,134 thousand (US$15,117 thousand), respectively.