Business Segment Data (Details) - Business Segment Data (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Revenues	$ 6,464	$ 4,096
Operating income (loss):
Operating Income (Loss)	(133)	(1,209)
Corporate general and administrative expenses	1,749	1,911
Interest expense, net	(70)	(41)
Change in warrant liabilities	47	(68)
Loss from continuing operations before income taxes	(156)	(1,318)
Income tax expense	(6)	(8)
Loss from continuing operations	(162)	(1,326)
Operating Segments [Member] | Digital Display Sales [Member]
Revenues:
Revenues	5,209	2,451
Operating income (loss):
Operating Income (Loss)	270	(1,008)
Operating Segments [Member] | Digital Display Lease And Maintenance [Member]
Revenues:
Revenues	1,255	1,645
Operating income (loss):
Operating Income (Loss)	230	262
Operating Segments [Member]
Operating income (loss):
Operating Income (Loss)	(133)	(1,209)
Corporate, Non-Segment [Member]
Operating income (loss):
Corporate general and administrative expenses	$ (633)	$ (463)