Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Revenues:		$ 3,539
Cost of revenues		100
Gross profit		3,439
Operating expenses:
Engineering and product development		143
Selling and marketing		620
General and administrative		2,342
Income (loss) from discontinued operations before interest and other financing expense, net		334
Interest and other financing expense, net		(77)
Income (loss) from discontinued operations before income taxes		257
Income tax benefit allocated to discontinued operations		(21)
Income (loss) from discontinued operations		236
Gain (loss) from disposal of discontinued operations, net of taxes	79	(2,085)
Net Gain (loss) from discontinued operations	$ 79	$ (1,849)