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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Concentration Risk [Line Items]        
Revenues $ 117,079 $ 97,515 $ 287,324 $ 303,448
South Korea [Member]        
Concentration Risk [Line Items]        
Revenues 66,667 70,042 167,154 190,303
China [Member]        
Concentration Risk [Line Items]        
Revenues 43,569 23,205 101,911 98,955
Japan [Member]        
Concentration Risk [Line Items]        
Revenues 2,279 1,137 6,263 3,802
Other Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 663 539 1,475 1,718
Total Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 113,178 94,923 276,803 294,778
United States [Member]        
Concentration Risk [Line Items]        
Revenues $ 3,901 $ 2,592 $ 10,521 $ 8,670