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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Statement [Abstract]    
Contract revenue    $ 395
Operating expenses:    
Research and development 3,329 1,141
General and administrative 1,440 569
Total operating expenses 4,769 1,710
Operating loss (4,769) (1,315)
Interest expense, net (61) (1)
Loss from continuing operations (4,830) (1,316)
Loss from discontinued operations (91) (103)
Net loss $ (4,921) $ (1,419)
Basic and diluted net loss per share:    
Loss from continuing operations $ (0.02) $ (0.03)
Net loss $ (0.02) $ (0.04)
Shares used to compute basic and diluted net loss per share 200,046 39,869