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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Concentration Risk [Line Items]        
Total revenue $ 146,565 $ 136,561 $ 277,032 $ 287,031
South Korea [Member]        
Concentration Risk [Line Items]        
Total revenue 82,029 79,096 148,089 168,783
China [Member]        
Concentration Risk [Line Items]        
Total revenue 57,520 51,180 114,947 106,580
Japan [Member]        
Concentration Risk [Line Items]        
Total revenue 1,509 1,392 3,156 2,445
Other Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Total revenue 1,978 715 3,315 1,015
Total Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Total revenue 143,036 132,383 269,507 278,823
United States [Member]        
Concentration Risk [Line Items]        
Total revenue $ 3,529 $ 4,178 $ 7,525 $ 8,208