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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Concentration Risk [Line Items]        
Revenues $ 57,968 $ 118,168 $ 170,245 $ 205,933
South Korea [Member]        
Concentration Risk [Line Items]        
Revenues 31,062 58,762 100,487 120,261
China [Member]        
Concentration Risk [Line Items]        
Revenues 20,508 54,972 58,342 75,750
Japan [Member]        
Concentration Risk [Line Items]        
Revenues 2,197 818 3,984 2,665
Other Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 315 597 812 1,179
Total Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 54,082 115,149 163,625 199,855
United States [Member]        
Concentration Risk [Line Items]        
Revenues $ 3,886 $ 3,019 $ 6,620 $ 6,078