Quarterly Financial Information (unaudited) (Details 1) (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
Income per share:
Basic earnings per common share	$ (0.02)	$ (0.03)	$ (0.01)	$ 0.00	$ 0.04	$ (0.01)	$ 0.02	$ 0.02	$ (0.06)	$ 0.09	$ 0.14
Diluted Earnings Per Common Share	$ (0.02)	$ (0.03)	$ (0.01)	$ 0.00	$ 0.04	$ (0.01)	$ 0.02	$ 0.02	$ (0.06)	$ 0.08	$ 0.13
Basic earnings per common share from continuing operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.03	$ 0.04	$ 0.02	$ 0.05	$ 0.04	$ 0.02	$ 0.16	$ 0.19
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ (0.01)	$ (0.03)	$ (0.01)	$ (0.03)	$ 0.00	$ (0.03)	$ (0.03)	$ (0.02)	$ (0.08)	$ (0.07)	$ (0.05)
Diluted earnings per common share from continuing operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.03	$ 0.04	$ 0.02	$ 0.05	$ 0.04	$ 0.02	$ 0.15	$ 0.18
Discontinued operations	$ (0.01)	$ (0.03)	$ (0.01)	$ (0.03)	$ 0.00	$ (0.03)	$ (0.03)	$ (0.02)	$ (0.08)	$ (0.07)	$ (0.05)
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 27,854	$ 25,137	$ 26,094	$ 26,086	$ 28,249	$ 26,104	$ 28,496	$ 28,322	$ 105,171	$ 111,171	$ 108,864
Cost of product revenues	15,806	13,838	14,005	13,826	14,856	14,135	14,901	14,939	57,475	58,831	58,672
Gross profit	12,048	11,299	12,089	12,260	13,393	11,969	13,595	13,383	47,696	52,340	50,192
Total operating expenses	12,997	10,885	11,343	10,934	11,255	10,813	11,121	11,321	46,159	44,510	41,787
Operating income	(949)	414	746	1,326	2,138	1,156	2,474	2,062	1,537	7,830	8,405
Other (expense) income, net	(319)	(358)	(330)	(95)	(149)	(178)	(226)	(385)	(1,102)	(938)	(1,537)
Income From Continuing Operations, Total	(1,268)	56	416	1,231	1,989	978	2,248	1,677	435	6,892	6,868
Total Income Tax Expense (Benefit)	(1,013)	105	321	299	817	278	698	605	(288)	2,398	1,579
Net income	(756)	(984)	(186)	96	1,200	(133)	774	529	(1,830)	2,370	3,812
Income from continuing operations	(255)	(49)	95	932	1,172	700	1,550	1,072	723	4,494	5,289
Income from discontinued operations, net of tax	$ (501)	$ (935)	$ (281)	$ (836)	$ 28	$ (833)	$ (776)	$ (543)	$ (2,553)	$ (2,124)