Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 38,391	$ 33,671	$ 35,401	$ 38,792	$ 40,827	$ 38,157	$ 37,928	$ 40,577	$ 146,255	$ 157,489	$ 166,370
Gross profit	8,105	7,115	7,084	9,019	9,590	9,472	9,064	10,969	31,323	39,095	43,481
(Loss) income from continuing operations	(6,737)	(2,193)	(5,595)	(3,138)	(578)	(1,330)	(1,621)	(57)	(17,663)	(3,586)	1,421
Income from discontinued operations	0	0	65	0	0	62	0	0
Net (loss) income	(6,737)	(2,193)	(5,530)	(3,138)	(578)	(1,268)	(1,621)	(57)	(17,598)	(3,524)	1,476
Continuing operations, basic	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.01)	$ (0.02)	$ (0.02)	$ 0.00	$ (0.25)	$ (0.05)	$ 0.02
Discontinued operations, basic	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net (loss) income, basic	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.01)	$ (0.02)	$ (0.02)	$ 0.00	$ (0.25)	$ (0.05)	$ 0.02
Continuing operations, diluted	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.01)	$ (0.02)	$ (0.02)	$ 0.00	$ (0.25)	$ (0.05)	$ 0.02
Discontinued operations, diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net (loss) income, diluted	$ (0.10)	$ (0.03)	$ (0.08)	$ (0.05)	$ (0.01)	$ (0.02)	$ (0.02)	$ 0.00	$ (0.25)	$ (0.05)	$ 0.02
Deferred revenue, revenue recognized	700
Deferred revenue attributable to prior years [Member]
Deferred revenue, revenue recognized	500
Deferred revenue attributable to 9 mos ended Sept 30, 2012 [Member]
Deferred revenue, revenue recognized	$ 200