Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets

The net carrying amounts related to acquired intangible assets are as follows ($ in thousands): 

	Net Carrying Amount			Weighted average amortization period (years)
Patent Portfolios and Patent Rights at December 31, 2016, net	$	4,951			3.65
Amortization expenses		(1,373	)
Patent Portfolios and Patent Rights at December 31, 2017, net	$	3,578			2.67
Amortization expenses		(1,405	)
Impairment loss		(2,173	)
Patent Portfolios and Patent Rights at December 31, 2018, net	$	—			—