Business Segment Data (Details) - Business Segment Data - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 8,162	$ 6,123	$ 18,560	$ 18,488
Operating income (loss):
Operating Income (Loss)	278	(343)	(819)	(2,477)
Interest expense, net	(87)	(49)	(210)	(189)
Warrant expense and change in warrant liabilities	(18)	(7)	(53)	(383)
Income (loss) before income taxes	$ 173	(399)	(1,082)	(3,049)
Income tax expense		(8)	(8)	(24)
Net income (loss)	$ 173	(407)	(1,090)	(3,073)
Corporate, Non-Segment [Member]
Operating income (loss):
Operating Income (Loss)	(590)	(624)	(2,009)	(1,978)
Digital Display Sales [Member]
Segment Reporting Information [Line Items]
Revenues	7,289	4,861	15,809	14,639
Digital Display Sales [Member] | Operating Segments [Member]
Operating income (loss):
Operating Income (Loss)	743	(11)	554	(945)
Digital Display Lease And Maintenance [Member]
Segment Reporting Information [Line Items]
Revenues	873	1,262	2,751	3,849
Digital Display Lease And Maintenance [Member] | Operating Segments [Member]
Operating income (loss):
Operating Income (Loss)	$ 125	$ 292	$ 636	$ 446