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SEGMENT INFORMATION - Revenue From External Customers Based Major Categories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Geographical Areas [Line Items]      
Revenue $ 472,672 $ 425,772 $ 433,893
At a point in time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 427,192 395,818 407,410
Over time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 45,480 29,954 26,483
North Asia      
Disclosure Of Geographical Areas [Line Items]      
Revenue 72,608 58,649 77,329
North Asia | At a point in time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 69,107 55,982 77,287
North Asia | Over time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 3,501 2,667 42
Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 172,793 166,925 171,841
Thailand | At a point in time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 172,766 166,832 171,613
Thailand | Over time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 27 93 228
ROW      
Disclosure Of Geographical Areas [Line Items]      
Revenue 227,271 200,198 184,723
ROW | At a point in time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 185,319 173,004 158,510
ROW | Over time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 41,952 27,194 26,213
Corporate expense adjustments and eliminations      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | At a point in time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
Corporate expense adjustments and eliminations | Over time      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
Power      
Disclosure Of Geographical Areas [Line Items]      
Revenue 229,392 221,074 182,171
Power | North Asia      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 9 92
Power | Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 70,947 80,564 46,340
Power | ROW      
Disclosure Of Geographical Areas [Line Items]      
Revenue 158,445 140,501 135,739
Power | Corporate expense adjustments and eliminations      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
Enamel      
Disclosure Of Geographical Areas [Line Items]      
Revenue 151,313 137,441 178,124
Enamel | North Asia      
Disclosure Of Geographical Areas [Line Items]      
Revenue 68,980 55,959 76,002
Enamel | Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 82,333 79,510 102,122
Enamel | ROW      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 1,972 0
Enamel | Corporate expense adjustments and eliminations      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
SDI      
Disclosure Of Geographical Areas [Line Items]      
Revenue 63,388 57,695 45,931
SDI | North Asia      
Disclosure Of Geographical Areas [Line Items]      
Revenue 3,501 2,667 1,209
SDI | Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
SDI | ROW      
Disclosure Of Geographical Areas [Line Items]      
Revenue 59,887 55,028 44,722
SDI | Corporate expense adjustments and eliminations      
Disclosure Of Geographical Areas [Line Items]      
Revenue 0 0 0
Others      
Disclosure Of Geographical Areas [Line Items]      
Revenue 28,579 9,562 27,667
Others | North Asia      
Disclosure Of Geographical Areas [Line Items]      
Revenue 127 14 26
Others | Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 19,513 6,851 23,379
Others | ROW      
Disclosure Of Geographical Areas [Line Items]      
Revenue 8,939 2,697 4,262
Others | Corporate expense adjustments and eliminations      
Disclosure Of Geographical Areas [Line Items]      
Revenue $ 0 $ 0 $ 0