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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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net revenue
Product	$ 975	$ 60	$ 1,556	$ 121
Royalty and other	774	1,060	1,525	2,334
Total net revenue	1,749	1,120	3,081	2,455
Cost of net revenue	1,022	77	1,599	96
Gross profit	727	1,043	1,482	2,359
Operating expenses
Research and development	6,432	5,983	13,486	11,303
Selling, general and administrative	1,490	1,460	3,287	3,083
Gain on sale of assets				(630)
Total operating expenses	7,922	7,443	16,773	13,756
Loss from operations	(7,195)	(6,400)	(15,291)	(11,397)
Other income, net	55	24	85	44
Loss before income taxes	(7,140)	(6,376)	(15,206)	(11,353)
Income tax provision	21	20	42	40
Net loss	(7,161)	(6,396)	(15,248)	(11,393)
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on available-for-sale securities	6	(74)	(3)	(70)
Comprehensive loss	$ (7,155)	$ (6,470)	$ (15,251)	$ (11,463)
Net loss per share
Basic and diluted (in dollars per share)	$ (0.14)	$ (0.15)	$ (0.31)	$ (0.27)
Shares used in computing net loss per share
Basic and diluted (in shares)	49,511	43,892	49,344	42,078

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Represents the amount of revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property and revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts.

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