Business Segment Data (Details) - Business Segment Data - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 6,044	$ 5,901	$ 10,398	$ 12,365
Operating income (loss):
Operating Income (Loss)	(492)	(2,001)	(1,097)	(2,134)
Interest expense, net	(73)	(70)	(123)	(140)
Warrant expense and change in warrant liabilities	(17)	(423)	(35)	(376)
Loss before income taxes	$ (582)	(2,494)	(1,255)	(2,650)
Income tax expense		(10)	(8)	(16)
Net loss	$ (582)	(2,504)	(1,263)	(2,666)
Corporate, Non-Segment [Member]
Operating income (loss):
Operating Income (Loss)	(853)	(721)	(1,419)	(1,354)
Digital Display Sales [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	5,114	4,569	8,520	9,778
Operating income (loss):
Operating Income (Loss)	120	(1,204)	(189)	(934)
Digital Display Lease And Maintenance [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	930	1,332	1,878	2,587
Operating income (loss):
Operating Income (Loss)	$ 241	$ (76)	$ 511	$ 154