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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Concentration Risk [Line Items]    
Revenues $ 55,566 $ 29,703
South Korea [Member]    
Concentration Risk [Line Items]    
Revenues 47,928 25,963
China [Member]    
Concentration Risk [Line Items]    
Revenues 2,482 1,757
Japan [Member]    
Concentration Risk [Line Items]    
Revenues 1,084 1,287
Other Non-U.S. Locations [Member]    
Concentration Risk [Line Items]    
Revenues 712 613
Total Non-U.S. Locations [Member]    
Concentration Risk [Line Items]    
Revenues 52,206 29,620
UNITED STATES    
Concentration Risk [Line Items]    
Revenues $ 3,360 $ 83