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Inventories | 12 Months Ended
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Dec. 31, 2018
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Inventories |
| 12. | 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 |
The cost of inventories recognized as operating costs for the years ended December 31, 2016, 2017 and 2018 were NT$219,630,270 thousand, NT$237,193,286 thousand and NT$309,020,850 thousand (US$10,095,421 thousand), respectively, which included write-downs of inventories at NT$451,780 thousand, NT$398,824 thousand and NT$980,927 thousand (US$32,046 thousand), respectively.

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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