Business Segment Data (Details) - Business Segment Data (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 5,901	$ 4,787	$ 12,365	$ 8,883
Operating Income (Loss)	(2,001)	(1,058)	(2,134)	(2,267)
Interest expense, net	(70)	(42)	(140)	(83)
Loss on sale of receivables		(348)		(348)
Change in warrant liabilities and other warrant expense	(423)	732	(376)	664
Loss from continuing operations before income taxes	(2,494)	(716)	(2,650)	(2,034)
Income tax expense	(10)	(8)	(16)	(16)
Loss from continuing operations	(2,504)	(724)	(2,666)	(2,050)
Corporate general and administrative expenses	2,686	2,120	4,435	4,031
Operating Segments [Member] | Digital Display Sales [Member]
Segment Reporting Information [Line Items]
Revenues	4,569	3,287	9,778	5,738
Operating Income (Loss)	(1,204)	(769)	(934)	(1,777)
Operating Segments [Member] | Digital Display Lease And Maintenance [Member]
Segment Reporting Information [Line Items]
Revenues	1,332	1,500	2,587	3,145
Operating Income (Loss)	(76)	81	154	343
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(2,001)	(1,058)	(2,134)	(2,267)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate general and administrative expenses	$ (721)	$ (370)	$ (1,354)	$ (833)