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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net revenue
Licensing and other	$ 781	$ 1,340	$ 5,987
Royalty	3,617	4,742	8,120
Total net revenue	4,398	6,082	14,107
Cost of net revenue
Licensing and other	474	334	3,295
Total cost of net revenue	474	334	3,295
Gross profit	3,924	5,748	10,812
Operating expenses
Research and development	23,325	28,480	26,216
Selling, general and administrative	6,161	8,218	8,869
Gain on sale of assets	(630)	(3,291)	(35,611)
Total operating expenses	28,856	33,407	(526)
Income (loss) from operations	(24,932)	(27,659)	11,338
Other income, net	209	155	206
Income (loss) before income taxes	(24,723)	(27,504)	11,544
Income tax provision	71	110	288
Net income (loss)	(24,794)	(27,614)	11,256
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on available-for-sale securities	2	10	(3)
Comprehensive income (loss)	$ (24,792)	$ (27,604)	$ 11,253
Net income (loss) per share
Basic (in dollars per share)	$ (0.55)	$ (0.70)	$ 0.30
Diluted (in dollars per share)	$ (0.55)	$ (0.70)	$ 0.28
Shares used in computing net income (loss) per share
Basic (in shares)	45,246	39,176	37,861
Diluted (in shares)	45,246	39,176	40,377

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