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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
 [1]
Sep. 30, 2016
Jun. 30, 2016
 [1]
Mar. 31, 2016
Dec. 31, 2015
 [1]
Sep. 30, 2015
Jun. 30, 2015
 [1],[2]
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Concentration Risk [Line Items]                      
Revenues $ 74,577 $ 30,214 $ 64,392 $ 29,703 $ 62,312 $ 39,419 $ 58,092 $ 31,223 $ 198,886 $ 191,046 $ 191,031
South Korea [Member]                      
Concentration Risk [Line Items]                      
Revenues                 181,771 168,267 141,922
China [Member]                      
Concentration Risk [Line Items]                      
Revenues                 7,180 2,685 1,260
Japan [Member]                      
Concentration Risk [Line Items]                      
Revenues                 4,310 16,542 44,903
Other Non-U.S. Locations [Member]                      
Concentration Risk [Line Items]                      
Revenues                 1,849 2,334 2,240
Total Non-U.S. Locations [Member]                      
Concentration Risk [Line Items]                      
Revenues                 195,110 189,828 190,325
UNITED STATES                      
Concentration Risk [Line Items]                      
Revenues                 $ 3,776 $ 1,218 $ 706
[1] The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.
[2] Includes a $33.0 million write down of inventory