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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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net revenue
Product	$ 437	$ 90	$ 1,993	$ 211
Royalty and other	716	867	2,241	3,201
Total net revenue	1,153	957	4,234	3,412
Cost of net revenue	447	158	2,046	254
Gross profit	706	799	2,188	3,158
Operating expenses
Research and development	7,507	6,243	20,993	17,546
Selling, general and administrative	1,689	1,595	4,976	4,678
Gain on sale of assets				(630)
Total operating expenses	9,196	7,838	25,969	21,594
Loss from operations	(8,490)	(7,039)	(23,781)	(18,436)
Other income, net	30	122	115	166
Loss before income taxes	(8,460)	(6,917)	(23,666)	(18,270)
Income tax provision	23	28	65	68
Net loss	(8,483)	(6,945)	(23,731)	(18,338)
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on available-for-sale securities	(17)	51	(20)	(19)
Comprehensive loss	$ (8,500)	$ (6,894)	$ (23,751)	$ (18,357)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.17)	$ (0.14)	$ (0.48)	$ (0.42)
Shares used in computing net loss per share
Basic and diluted (in shares)	49,634	48,164	49,441	44,173

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