INTANGIBLE ASSETS, NET, AND GOODWILL (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Write-off of abandoned patents	$ 96	$ 8
Amortization of intangible assets	$ 136	$ 126
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	17 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	20 years
STI | Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
STI | Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	11 years
STI | Domain name
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
GVR Trade S.A. | Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
GVR Trade S.A. | Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years