The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended
INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Purchased technology, net	$ 189		$ 179
Goodwill	185		185
Amortization of Intangible Assets	27	$ 27
Brand name and trademark (life indefinite)
Indefinite-lived Intangible Assets [Line Items]
Brand name and trademark	1,510		1,510
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Purchased technology	1,550		1,513
Less: accumulated amortization	(1,361)		(1,334)
Purchased technology, net	$ 189		$ 179
Purchased technology \| Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life (in years)	5 years
Purchased technology \| Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life (in years)	17 years