Business Segment Data (Details) - Business Segment Data (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Revenues	$ 6,123	$ 6,204	$ 18,488	$ 15,087
Operating (loss) income:
Operating loss	(343)	(286)	(2,477)	(2,553)
Interest expense, net	(49)	(15)	(189)	(98)
Other income		181		181
Loss on sale of receivables				(348)
Change in warrant liabilities and other warrant expense	(7)	296	(383)	960
(Loss) income from continuing operations before income taxes	(399)	176	(3,049)	(1,858)
Income tax expense	(8)	(8)	(24)	(24)
(Loss) income from continuing operations	(407)	168	(3,073)	(1,882)
General and Administrative Expense [Member] | Corporate, Non-Segment [Member]
Operating (loss) income:
Operating loss	(624)	(665)	(1,978)	(1,498)
Operating Segments [Member] | Digital Display Sales [Member]
Revenues:
Revenues	4,861	4,607	14,639	10,345
Operating (loss) income:
Operating loss	(11)	(51)	(945)	(1,828)
Operating Segments [Member] | Digital Display Lease And Maintenance [Member]
Revenues:
Revenues	1,262	1,597	3,849	4,742
Operating (loss) income:
Operating loss	$ 292	$ 430	$ 446	$ 773