Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Product sales	$ 2,651	$ 4,271	$ 4,549	$ 6,316
Royalties	3,287	3,197	5,711	5,766
Total revenue	5,938	7,468	10,260	12,082
Cost of revenue:
Product sales	1,675	2,505	2,880	3,567
Total cost of revenue	1,675	2,505	2,880	3,567
Gross profit	4,263	4,963	7,380	8,515
Operating expenses:
Selling, marketing and product support	2,471	2,703	5,191	4,753
General and administrative	1,498	1,592	2,870	2,962
Research and development	1,423	1,356	3,239	2,487
Investigation matter	36	1,129	152	2,738
Restructuring			460
Amortization of intangible assets	393	340	782	681
Total operating expenses	5,821	7,120	12,694	13,621
Loss from operations	(1,558)	(2,157)	(5,314)	(5,106)
Other income (expense), net	15	(4)	14	(2)
Loss before income taxes	(1,543)	(2,161)	(5,300)	(5,108)
Income tax benefit	(10)	(415)	(10)	(1,909)
Net loss	$ (1,533)	$ (1,746)	$ (5,290)	$ (3,199)
Net loss per share:
Basic	$ (0.31)	$ (0.35)	$ (1.06)	$ (0.65)
Diluted	$ (0.31)	$ (0.35)	$ (1.06)	$ (0.65)
Weighted average number of common shares outstanding:
Basic	4,980	4,967	4,978	4,939
Diluted	4,980	4,967	4,978	4,939