Business Segment Data (Detail) - Schedule of Revenue by Major Customers by Reporting Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 6,849	$ 5,090	$ 12,472	$ 10,007
Operating Income (Loss)	(1,025)	(1,261)	(2,680)	(2,563)
Interest expense, net	(74)	(363)	(187)	(724)
Gain on debt extinguishment	56		60
Change in warrant liabilities	1,789		1,897
Income (loss) from continuing operations before income taxes	746	(1,624)	(910)	(3,287)
Income tax expense	(7)	(7)	(14)	(14)
Income (loss) from continuing operations	739	(1,631)	(924)	(3,301)
Digital Display Sales [Member]
Revenues	5,014	3,119	8,851	5,967
Operating Income (Loss)	(369)	(654)	(1,510)	(1,398)
Digital Display Lease and Maintenance [Member]
Revenues	1,822	1,949	3,590	3,995
Operating Income (Loss)	152	97	368	277
Real Estate Rentals [Member]
Revenues	13	22	31	45
Operating Income (Loss)	(14)	3	(26)	6
General Corporate [Member]
Operating Income (Loss)	$ (794)	$ (707)	$ (1,512)	$ (1,448)