Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Product sales	$ 4,341	$ 3,403	$ 10,657	$ 8,983
Royalties	3,400	3,774	9,167	9,159
Total revenue	7,741	7,177	19,824	18,142
Cost of revenue (exclusive of amortization shown below):
Product sales	2,944	1,861	6,511	4,493
Gross profit	4,797	5,316	13,313	13,649
Operating expenses:
Selling, marketing and product support	2,792	1,567	7,545	5,237
General and administrative	1,464	1,532	4,426	4,072
Research and development	1,651	954	4,138	3,241
Investigation matter	476		3,214
Amortization of intangible assets	328	409	1,009	1,227
Restructuring				430
Goodwill impairment				3,175
Total operating expenses	6,711	4,462	20,332	17,382
Loss from operations	(1,914)	854	(7,019)	(3,733)
Other income, net	1	3	(1)	27
Loss before income taxes	(1,913)	857	(7,020)	(3,706)
Income tax benefit	22	(132)	(1,887)	(369)
Net loss	$ (1,935)	$ 989	$ (5,133)	$ (3,337)
Net loss per share:
Basic	$ (0.39)	$ 0.20	$ (1.04)	$ (0.68)
Diluted	$ (0.39)	$ 0.20	$ (1.04)	$ (0.68)
Weighted average number of common shares outstanding:
Basic	4,970	4,904	4,949	4,878
Diluted	4,970	4,964	4,949	4,878