Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]
Revenues from external customers	$ 14,967	$ 10,993	$ 10,841	$ 12,359	$ 15,191	$ 12,299	$ 11,180	$ 12,307	$ 49,160	$ 50,977	$ 51,082
Gross profit	3,818	1,973	2,552	3,199	3,947	3,282	2,754	3,316	11,542	13,299	13,556
(Loss) income from continuing operations	(1,487)	(3,564)	(3,177)	(2,027)	(1,059)	(1,318)	(2,614)	(2,086)	(10,255)	(7,077)	(7,802)
Income from discontinued operations	(512)	1,850	(1,825)	(533)	(5,678)	(875)	(2,916)	(1,052)
Net loss	$ (1,999)	$ (1,714)	$ (5,002)	$ (2,560)	$ (6,737)	$ (2,193)	$ (5,530)	$ (3,138)	$ (11,275)	$ (17,598)	$ (3,524)
Continuing operations, basic (usd per share)	$ (0.02)	$ (0.05)	$ (0.05)	$ (0.03)	$ (0.02)	$ (0.02)	$ (0.04)	$ (0.03)	$ (0.15)	$ (0.10)	$ (0.11)
Discontinued operations, basic (usd per share)	$ (0.01)	$ 0.03	$ (0.03)	$ (0.01)	$ (0.08)	$ (0.01)	$ (0.04)	$ (0.02)	$ (0.01)	$ (0.15)	$ 0.06
Net (loss) income, basic (usd per share)	$ (0.03)	$ (0.02)	$ (0.07)	$ (0.04)	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.16)	$ (0.25)	$ (0.05)
Continuing operations, diluted (usd per share)	$ (0.02)	$ (0.05)	$ (0.05)	$ (0.03)	$ (0.02)	$ (0.02)	$ (0.04)	$ (0.03)	$ (0.15)	$ (0.10)	$ (0.11)
Discontinued operations, diluted (usd per share)	$ (0.01)	$ 0.03	$ (0.03)	$ (0.01)	$ (0.08)	$ (0.01)	$ (0.04)	$ (0.02)	$ (0.01)	$ (0.15)	$ 0.06
Net (loss) income, diluted (usd per share)	$ (0.03)	$ (0.02)	$ (0.07)	$ (0.04)	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.16)	$ (0.25)	$ (0.05)