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Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Contract revenue		$ 251		$ 646
Operating expenses:
Research and development	3,067	1,282	6,396	2,423
General and administrative	1,313	509	2,753	1,078
Total operating expenses	4,380	1,791	9,149	3,501
Operating loss	(4,380)	(1,540)	(9,149)	(2,855)
Interest expense, net	(146)	(263)	(207)	(264)
Loss from continuing operations	(4,526)	(1,803)	(9,356)	(3,119)
Loss from discontinued operations	(43)	(129)	(134)	(232)
Net loss	$ (4,569)	$ (1,932)	$ (9,490)	$ (3,351)
Basic and diluted net loss per share:
Decrease from continuing operations	$ (0.02)	$ (0.05)	$ (0.05)	$ (0.08)
Net loss	$ (0.02)	$ (0.05)	$ (0.05)	$ (0.08)
Shares used to compute basic and diluted net loss per share	200,112	40,016	200,079	40,062

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