Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Product sales	$ 4,271	$ 2,671	$ 6,316	$ 5,580
Royalties	3,197	3,037	5,766	5,385
Total revenue	7,468	5,708	12,082	10,965
Cost of revenue (exclusive of amortization shown below):
Product sales	2,505	1,318	3,567	2,632
Gross profit	4,963	4,390	8,515	8,333
Operating expenses:
Selling, marketing and product support	2,703	1,821	4,753	3,670
General and administrative	1,592	1,309	2,962	2,540
Research and development	1,356	1,017	2,487	2,287
Investigation matter	1,129		2,738
Amortization of intangible assets	340	410	681	818
Restructuring		354		430
Goodwill impairment		3,175		3,175
Total operating expenses	7,120	8,086	13,621	12,920
Loss from operations	(2,157)	(3,696)	(5,106)	(4,587)
Other income, net	(4)	19	(2)	24
Loss before income taxes	(2,161)	(3,677)	(5,108)	(4,563)
Income tax benefit	(415)	(19)	(1,909)	(237)
Net loss	$ (1,746)	$ (3,658)	$ (3,199)	$ (4,326)
Net loss per share:
Basic	$ (0.35)	$ (0.75)	$ (0.65)	$ (0.89)
Diluted	$ (0.35)	$ (0.75)	$ (0.65)	$ (0.89)
Weighted average number of common shares outstanding:
Basic	4,967	4,877	4,939	4,865
Diluted	4,967	4,877	4,939	4,865