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Inventories | 12 Months Ended
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Dec. 31, 2017
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Inventories |
| 10. | INVENTORIES
|  | December 31
|  | 2016 |  | 2017
|  | NT$ |  | NT$ |  | US$ (Note 4)
Finished goods |  | $ | 6,519,465 |  |  | $ | 6,740,816 |  |  | $ | 227,423 |
Work in process |  |  | 2,822,687 |  |  |  | 3,452,332 |  |  |  | 116,475 |
Raw materials |  |  | 10,850,062 |  |  |  | 12,625,502 |  |  |  | 425,962 |
Supplies |  |  | 795,093 |  |  |  | 894,196 |  |  |  | 30,168 |
Raw materials and supplies in transit |  |  | 450,755 |  |  |  | 548,065 |  |  |  | 18,491 |
|  | $ | 21,438,062 |  |  | $ | 24,260,911 |  |  | $ | 818,519 |
The cost of inventories recognized as operating costs for the years ended December 31, 2015, 2016 and 2017 were NT$233,165,722 thousand, NT$219,630,270 thousand (retrospectively adjusted) and NT$237,193,286 thousand (US$8,002,473 thousand), respectively, which included write-downs of inventories at NT$352,011 thousand, NT$451,780 thousand and NT$398,824 thousand (US$13,456 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 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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