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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]      
Revenues $ 553,525 $ 428,867 $ 405,177
South Korea [Member]      
Concentration Risk [Line Items]      
Revenues 334,835 263,079 250,562
China [Member]      
Concentration Risk [Line Items]      
Revenues 192,079 142,076 135,259
Japan [Member]      
Concentration Risk [Line Items]      
Revenues 7,358 7,405 5,276
Other Non-U.S. Locations [Member]      
Concentration Risk [Line Items]      
Revenues 3,137 1,728 2,270
Total Non-U.S. Locations [Member]      
Concentration Risk [Line Items]      
Revenues 537,409 414,288 393,367
United States [Member]      
Concentration Risk [Line Items]      
Revenues $ 16,116 $ 14,579 $ 11,810