Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Revenues:		$ 3,880
Cost of revenues		100
Gross profit		3,780
Operating expenses:
Engineering and product development		143
Selling and marketing		620
General and administrative		2,342
Other income, net		(1,504)
Loss on sale of assets		4,652
Loss from discontinued operations before interest and other financing expense, net		(2,473)
Interest and other financing expense, net
Loss from discontinued operations before income taxes		(2,473)
Income tax expense allocated to discontinued operations		(14)
Loss from discontinued operations	$ (172)	(2,459)
Loss from disposal of discontinued operations, net of taxes	(172)
Net loss from discontinued operations	$ (172)	$ (2,459)