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Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Contract revenue				$ 646
Operating expenses:
Research and development	3,626	2,929	10,022	5,352
General and administrative	2,428	1,160	5,181	2,238
Total operating expenses	6,054	4,089	15,203	7,590
Operating loss	(6,054)	(4,089)	(15,203)	(6,944)
Interest expense, net	(195)	(62)	(402)	(326)
Loss from continuing operations	(6,249)	(4,151)	(15,605)	(7,270)
Income (loss) from discontinued operations	128	(51)	(6)	(283)
Net loss	$ (6,121)	$ (4,202)	$ (15,611)	$ (7,553)
Basic and diluted net loss per share:
Loss from continuing operations	$ (0.02)	$ (0.02)	$ (0.07)	$ (0.08)
Net loss	$ (0.02)	$ (0.02)	$ (0.07)	$ (0.08)
Shares used to compute basic and diluted net loss per share	274,488	198,279	225,063	93,381

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