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N. SEGMENT AND GEOGRAPHIC INFORMATION - NARRATIVE (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 84,900 $ 70,137 $ 55,254 $ 50,422 $ 52,952 $ 57,085 $ 49,632 $ 30,234 $ 260,713 $ 189,903 $ 130,449
Internet data center [Member] | Sales Revenue, Net [Member]                      
Revenues                 $ 201,300 $ 123,200 $ 64,400
Concentration percentage                 77.20% 64.90% 49.40%
CATV markets [Member] | Sales Revenue, Net [Member]                      
Revenues                 $ 43,600 $ 53,700 $ 47,400
Concentration percentage                 16.70% 28.30% 36.30%
FTTH markets [Member] | Sales Revenue, Net [Member]                      
Revenues                 $ 1,600 $ 2,500 $ 13,600
Concentration percentage                 0.60% 1.30% 10.40%
Telecom markets [Member] | Sales Revenue, Net [Member]                      
Revenues                 $ 12,900 $ 9,700 $ 3,900
Concentration percentage                 5.00% 5.10% 3.00%