ACQUISITIONS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Amortization expense	$ 1,746	$ 1,817
Harmonics Holdings Incorporated [Member]
Intangible assets acquired	995
Amortization expense	93
Harmonics Holdings Incorporated [Member] | Technology Related Industry Accreditations [Member]
Intangible assets acquired	83
Pacific Power Systems Integration Incorporated [Member]
Intangible assets acquired	1,562
Amortization expense	62
Pacific Power Systems Integration Incorporated [Member] | Technology Related Industry Accreditations [Member]
Intangible assets acquired	$ 870
Customer Relationships [Member] | Harmonics Holdings Incorporated [Member]
Amortization period of identifiable intangible assets	10 years
Intangible assets acquired	$ 319
Customer Relationships [Member] | Pacific Power Systems Integration Incorporated [Member]
Amortization period of identifiable intangible assets	13 years
Intangible assets acquired	$ 512
Noncompete Agreements [Member] | Harmonics Holdings Incorporated [Member]
Amortization period of identifiable intangible assets	5 years
Intangible assets acquired	$ 75
Noncompete Agreements [Member] | Pacific Power Systems Integration Incorporated [Member]
Amortization period of identifiable intangible assets	7 years
Intangible assets acquired	$ 180
Developed Technology [Member] | Harmonics Holdings Incorporated [Member]
Amortization period of identifiable intangible assets	10 years
Intangible assets acquired	$ 492
Trademarks [Member] | Harmonics Holdings Incorporated [Member]
Intangible assets acquired	$ 26