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Inventories | 12 Months Ended
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Dec. 31, 2019
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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.

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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 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS02_g36-39_TI -URIDate 2019-03-27 + Details
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