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Condensed Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating expenses:    
Research and development $ 6,772 $ 3,329
General and administrative 5,980 1,440
Total operating expenses 12,752 4,769
Operating loss (12,752) (4,769)
Interest expense, net (201) (61)
Loss from continuing operations (12,953) (4,830)
Loss from discontinued operations 0 (91)
Net loss $ (12,953) $ (4,921)
Basic and diluted net loss per share:    
Loss from continuing operations $ (0.04) $ (0.02)
Net loss $ (0.04) $ (0.02)
Shares used to compute basic and diluted net loss per share 305,075 200,046