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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (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
Net revenue
Licensing and other	$ 141	$ 248	$ 550	$ 1,113
Royalty	816	1,079	2,862	3,374
Total net revenue	957	1,327	3,412	4,487
Cost of net revenue
Licensing and other	158	53	254	289
Total cost of net revenue	158	53	254	289
Gross profit	799	1,274	3,158	4,198
Operating expenses
Research and development	6,243	7,026	17,546	21,220
Selling, general and administrative	1,595	1,738	4,678	6,092
Gain on sale of assets		(1,435)	(630)	(3,291)
Total operating expenses	7,838	7,329	21,594	24,021
Loss from operations	(7,039)	(6,055)	(18,436)	(19,823)
Other income, net	122	61	166	121
Loss before income taxes	(6,917)	(5,994)	(18,270)	(19,702)
Income tax provision	28	79	68	139
Net loss	(6,945)	(6,073)	(18,338)	(19,841)
Other comprehensive loss, net of tax:
Net unrealized gains (losses) on available-for-sale securities	51	27	(19)	25
Comprehensive loss	$ (6,894)	$ (6,046)	$ (18,357)	$ (19,816)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.14)	$ (0.15)	$ (0.42)	$ (0.51)
Shares used in computing net loss per share
Basic and diluted (in shares)	48,164	39,299	44,173	38,919

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