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Segment Information - Revenue From External Customers Based Major Categories (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 338,160 | $ 425,940 | $ 425,215
At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 331,190 | 408,992 |
Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 6,970 | 16,948 |
North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 76,575 | 103,647 |
North Asia (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 76,575 | 103,647 |
Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 172,379 | 213,424 |
Thailand (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 172,031 | 213,212 |
Thailand (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 348 | 212 |
ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 89,206 | 108,869 |
ROW (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 82,584 | 92,133 |
ROW (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 6,622 | 16,736 |
Power [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 128,179 | 156,901 |
Power [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 49,493 | 64,771 |
Power [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 78,686 | 92,130 |
Enamel [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 179,572 | 217,894 |
Enamel [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 76,575 | 103,647 |
Enamel [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 102,997 | 114,247 |
Others [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 30,409 | 51,145 |
Others [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 19,889 | 34,406 |
Others [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 10,520 | $ 16,739 |
Manufactured Products [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  |  | 361,853
Distributed Products [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  |  | 41,985
SDI [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue |  |  | $ 21,377

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- Definition Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23_a&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 32 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_32&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_33_a&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 82 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_a&doctype=Standard -URIDate 2019-03-27 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_103&doctype=Standard -URIDate 2019-03-27 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_102&doctype=Standard -URIDate 2019-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2019-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2019-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2019-03-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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