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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Concentration Risk [Line Items]        
Revenues $ 61,683 $ 30,214 $ 219,762 $ 124,309
South Korea [Member]        
Concentration Risk [Line Items]        
Revenues 45,803 24,852 185,937 111,994
China [Member]        
Concentration Risk [Line Items]        
Revenues 10,234 2,095 18,130 5,663
Japan [Member]        
Concentration Risk [Line Items]        
Revenues 2,462 1,230 5,590 3,334
Other Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 597 396 2,132 1,416
Total Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 59,096 28,573 211,789 122,407
UNITED STATES        
Concentration Risk [Line Items]        
Revenues $ 2,587 $ 1,641 $ 7,973 $ 1,902