Quarterly Results of Operations (Unaudited) (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	Dec. 31, 2009
Quarterly consolidated statement of operations data
Revenues (1)	$ 8,860	$ 7,142	$ 6,476	$ 9,691	$ 7,690	$ 6,495	$ 6,682	$ 9,768	$ 32,169	$ 30,635	$ 31,124
Gross profit	8,474	6,869	6,262	9,376	7,348	6,303	6,435	9,294
Operating income (loss)	(171)	(2,938)	(2,310)	324	225	(1,042)	(1,113)	1,877	(5,095)	(53)	(4,828)
Income (loss) from continuing operations before provision for taxes	(145)	(2,872)	(2,242)	334	257	(984)	(1,061)	1,939	(4,925)	151	(4,556)
Provision for income taxes	(55)	(118)	(66)	(553)	(527)	(428)	(267)	(594)	(792)	(1,816)	(1,501)
Income (loss) from continuing operations	(200)	(2,990)	(2,308)	(219)	(270)	(1,412)	(1,328)	1,345	(5,717)	(1,665)	(6,057)
Net income from discontinued operations (net of tax)	0	0	153	0	0	0	18	43	153	61	130	187
Net loss	$ (200)	$ (2,990)	$ (2,155)	$ (219)	$ (270)	$ (1,412)	$ (1,310)	$ 1,388	$ (5,564)	$ (1,604)	$ (5,927)
Basic net income (loss) per share
Continuing operations (2)	$ (0.01)	$ (0.11)	$ (0.08)	$ (0.01)	$ (0.01)	$ (0.05)	$ (0.05)	$ 0.05
Discontinued operations (2)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Total (2)	$ (0.01)	$ (0.11)	$ (0.08)	$ (0.01)	$ (0.01)	$ (0.05)	$ (0.05)	$ 0.05
Shares used in calculating basic net income (loss) per share	27,288	27,658	28,058	27,941	28,471	28,918	28,610	28,249
Diluted net income (loss) per share
Continuing operations (2)	$ (0.01)	$ (0.11)	$ (0.08)	$ (0.01)	$ (0.01)	$ (0.05)	$ (0.05)	$ 0.05
Discontinued operations (2)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Total (2)	$ (0.01)	$ (0.11)	$ (0.08)	$ (0.01)	$ (0.01)	$ (0.05)	$ (0.05)	$ 0.05
Shares used in calculating diluted net income (loss) per share	27,288	27,658	28,058	27,941	28,471	28,918	28,610	28,960