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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Concentration Risk [Line Items]        
Revenues $ 102,513 $ 64,392 $ 158,079 $ 94,095
South Korea [Member]        
Concentration Risk [Line Items]        
Revenues 92,206 61,196 140,134 87,142
China [Member]        
Concentration Risk [Line Items]        
Revenues 5,414 1,812 7,896 3,569
Japan [Member]        
Concentration Risk [Line Items]        
Revenues 2,044 800 3,128 2,104
Other Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 822 405 1,534 1,018
Total Non-U.S. Locations [Member]        
Concentration Risk [Line Items]        
Revenues 100,486 64,213 152,692 93,833
UNITED STATES        
Concentration Risk [Line Items]        
Revenues $ 2,027 $ 179 $ 5,387 $ 262