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Condensed Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Contract revenue		$ 351	$ 646	$ 1,122
Operating expenses:
Research and development	2,929	1,541	5,352	5,762
General and administrative	1,160	445	2,238	3,561
Total operating expenses	4,089	1,986	7,590	9,323
Operating loss	(4,089)	(1,635)	(6,944)	(8,201)
Interest expense, net	(62)	(1)	(326)	(2)
Gain on sale of royalty interest				2,500
Loss from continuing operations	(4,151)	(1,636)	(7,270)	(5,703)
Loss from discontinued operations	(51)	(36)	(283)	(47)
Net loss	$ (4,202)	$ (1,672)	$ (7,553)	$ (5,750)
Basic and diluted net loss per share:
Loss from continuing operations	$ (0.02)	$ (0.04)	$ (0.08)	$ (0.14)
Net loss	$ (0.02)	$ (0.04)	$ (0.08)	$ (0.15)
Shares used to compute basic and diluted net loss per share	198,279	39,507	93,381	39,481

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