Quarterly Financial Information (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
Revenues [Abstract]
Services	$ 15,344	$ 14,769	$ 13,744	$ 13,765	$ 11,124	$ 8,532	$ 8,442	$ 9,150	$ 57,622	$ 37,248	$ 32,276
Software and other	3,533	3,407	3,569	3,823	3,881	3,818	5,012	3,880	14,332	16,591	11,901
Total revenue	18,877	18,176	17,313	17,588	15,005	12,350	13,454	13,030	71,954	53,839	44,177
Costs of revenue:
Cost of services	8,648	8,815	9,591	10,291	8,584	7,917	6,601	6,817	37,343	29,919	26,737
Cost of software and other	278	312	361	470	449	458	433	404	1,421	1,744	1,358
Total cost of revenue	8,926	9,127	9,952	10,761	9,033	8,375	7,034	7,221	38,764	31,663	28,095
Gross profit	9,951	9,049	7,361	6,827	5,972	3,975	6,420	5,809	33,190	22,176	16,082
Operating expenses:
Research and development	1,652	1,643	1,708	1,770	1,599	1,577	1,433	1,448	6,773	6,057	5,214
Sales and marketing	3,377	3,789	4,989	6,130	5,509	5,954	5,543	4,785	18,285	21,791	18,091
General and administrative	3,572	2,897	2,850	2,914	2,706	3,074	3,439	2,786	12,234	12,005	10,963
Amortization of intangible assets and other	368	397	391	367	331	330	122	83	1,522	866	364
Total operating expenses	8,969	8,726	9,938	11,181	10,145	10,935	10,537	9,102	38,814	40,719	34,632
Loss from operations	982	323	(2,577)	(4,354)	(4,173)	(6,960)	(4,117)	(3,293)	(5,624)	(18,543)	(18,550)
Interest income and other, net	71	93	59	75	84	96	125	150	297	455	540
Loss from continuing operations, before income taxes	1,053	416	(2,518)	(4,279)	(4,089)	(6,864)	(3,992)	(3,143)	(5,327)	(18,088)	(18,010)
Income tax provision	(145)	118	116	118	106	264	29	2	208	401	88
Loss from continuing operations, after income taxes	1,198	298	(2,634)	(4,397)	(4,195)	(7,128)	(4,021)	(3,145)	(5,535)	(18,489)	(18,098)
Income (loss) from discontinued operations, after income taxes	101	(7)	(7)	24	(154)	18	(18)	3	111	(151)	31
Net income (loss)	$ 1,299	$ 291	$ (2,641)	$ (4,373)	$ (4,349)	$ (7,110)	$ (4,039)	$ (3,142)	$ (5,424)	$ (18,640)	$ (18,067)
Basic and diluted earnings per share [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ 0.02	$ 0.01	$ (0.05)	$ (0.09)	$ (0.09)	$ (0.15)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.39)	$ (0.39)
Income (loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0	$ 0	$ 0.00	$ 0	$ 0.00	$ 0	$ 0.00	$ 0.00	$ 0	$ 0.00
Basic earnings (loss) per share (in dollars per share)	$ 0.03	$ 0.01	$ (0.05)	$ (0.09)	$ (0.09)	$ (0.15)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.39)	$ (0.39)
Diluted earnings (loss) per share (in dollars per share)	$ 0.02	$ 0.01	$ (0.05)	$ (0.09)	$ (0.09)	$ (0.15)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.39)	$ (0.39)