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N. SEGMENT AND GEOGRAPHIC INFORMATION - REVENUES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Number of Reportable segment | item                 1    
Revenues $ 84,900 $ 70,137 $ 55,254 $ 50,422 $ 52,952 $ 57,085 $ 49,632 $ 30,234 $ 260,713 $ 189,903 $ 130,449
UNITED STATES                      
Revenues                 18,035 16,766 30,723
TAIWAN, PROVINCE OF CHINA                      
Revenues                 161,611 141,107 77,680
CHINA                      
Revenues                 $ 81,067 $ 32,030 $ 22,046