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Segment Information - Revenue From External Customers Based Major Categories (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 313,564 | $ 338,160 | $ 425,940
At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 302,712 | 331,190 | 408,992
Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 10,852 | 6,970 | 16,948
North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 73,199 | 76,575 | 103,647
North Asia (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 73,199 | 76,575 | 103,647
Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 143,647 | 172,379 | 213,424
Thailand (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 143,463 | 172,031 | 213,212
Thailand (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 184 | 348 | 212
ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 96,718 | 89,206 | 108,869
ROW (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 86,050 | 82,584 | 92,133
ROW (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 10,668 | 6,622 | 16,736
Power [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 127,630 | 128,179 | 156,901
Power [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 48,851 | 49,493 | 64,771
Power [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 78,779 | 78,686 | 92,130
Enamel [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 131,150 | 179,572 | 217,894
Enamel [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 73,179 | 76,575 | 103,647
Enamel [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 57,971 | 102,997 | 114,247
Fabrication [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 33,101 |  |
Fabrication [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 33,101 |  |
Others [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 21,683 | 30,409 | 51,145
Others [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 20 |  |
Others [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 3,724 | 19,889 | 34,406
Others [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 17,939 | $ 10,520 | $ 16,739

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