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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net revenue
Licensing and other	$ 160	$ 644	$ 409	$ 865
Royalty	960	1,092	2,046	2,295
Total net revenue	1,120	1,736	2,455	3,160
Cost of net revenue
Licensing and other	77	179	96	236
Total cost of net revenue	77	179	96	236
Gross profit	1,043	1,557	2,359	2,924
Operating expenses
Research and development	5,983	6,688	11,303	14,194
Selling, general and administrative	1,460	1,428	3,083	4,354
Gain on sale of assets			(630)	(1,856)
Total operating expenses	7,443	8,116	13,756	16,692
Loss from operations	(6,400)	(6,559)	(11,397)	(13,768)
Other income and expense, net	24	36	44	60
Loss before income taxes	(6,376)	(6,523)	(11,353)	(13,708)
Income tax provision	20	30	40	60
Net loss	(6,396)	(6,553)	(11,393)	(13,768)
Other comprehensive loss, net of tax:
Net unrealized gains (losses) on available-for-sale securities	(74)	11	(70)	(2)
Comprehensive loss	$ (6,470)	$ (6,542)	$ (11,463)	$ (13,770)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.15)	$ (0.17)	$ (0.27)	$ (0.36)
Shares used in computing net loss per share
Basic and diluted (in shares)	43,892	38,880	42,078	38,723

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