CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net revenue
Licensing	$ 1,216	$ 2,019	$ 2,563	$ 3,566
Royalty	2,076	2,250	4,268	4,253
Total net revenue	3,292	4,269	6,831	7,819
Cost of net revenue
Licensing	469	541	1,159	1,323
Total cost of net revenue	469	541	1,159	1,323
Gross profit	2,823	3,728	5,672	6,496
Operating expenses
Research and development	6,566	6,704	12,721	12,677
Selling, general and administrative	1,917	2,508	4,631	5,106
Total operating expenses	8,483	9,212	17,352	17,783
Loss from operations	(5,660)	(5,484)	(11,680)	(11,287)
Other income and expense, net	25	83	34	192
Loss before income taxes	(5,635)	(5,401)	(11,646)	(11,095)
Income tax provision	17	26	35	58
Net loss	$ (5,652)	$ (5,427)	$ (11,681)	$ (11,153)
Net loss per share
Basic (in dollars per share)	$ (0.15)	$ (0.17)	$ (0.31)	$ (0.35)
Diluted (in dollars per share)	$ (0.15)	$ (0.17)	$ (0.31)	$ (0.35)
Shares used in computing net loss per share
Basic (in shares)	37,738	31,636	37,505	31,455
Diluted (in shares)	37,738	31,636	37,505	31,455