INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 185	$ 185
Intangibles	185	191
Purchased Technology
Finite-Lived Intangible Assets [Line Items]
Purchased technology (5-17 year lives)	1,442	1,448
Less: accumulated amortization	(1,442)	(1,442)
Purchased technology, net	$ 0	$ 6
Purchased Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life (in years)	5 years	5 years
Purchased Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life (in years)	17 years	17 years