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Segment Information - Revenue From External Customers Based Major Categories (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 476,659 | $ 313,564 | $ 338,160
At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 451,567 | 302,712 | 331,190
Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 25,092 | 10,852 | 6,970
North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 107,032 | 73,199 | 76,575
North Asia (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 107,032 | 73,199 | 76,575
Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 197,779 | 143,647 | 172,379
Thailand (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 197,544 | 143,463 | 172,031
Thailand (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 235 | 184 | 348
ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 171,848 | 96,718 | 89,206
ROW (Segment) [Member] | At a point in time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 146,991 | 86,050 | 82,584
ROW (Segment) [Member] | Over time [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 24,857 | 10,668 | 6,622
Power [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 191,520 | 127,630 | 128,179
Power [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 63,629 | 48,851 | 49,493
Power [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 127,891 | 78,779 | 78,686
Enamel [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 212,776 | 131,150 | 179,572
Enamel [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 107,027 | 73,179 | 76,575
Enamel [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 105,749 | 57,971 | 102,997
SDI [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 39,476 | 15,600 | 7,600
SDI [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 39,476 |  |
Others [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 32,887 | 21,683 | 30,409
Others [Member] | North Asia (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 5 | 20 |
Others [Member] | Thailand (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 28,401 | 3,724 | 19,889
Others [Member] | ROW (Segment) [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 4,481 | 17,939 | $ 10,520
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 |

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