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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]        
Revenue $ 106 $ 0 $ 106 $ 0
Cost of sales 0 0 0 0
Gross profit 106 0 106 0
Operating expenses        
Selling, general and administrative 7,218 5,238 14,643 9,404
Research and development 8,204 5,248 15,335 8,896
Total operating expenses 15,422 10,486 29,978 18,300
Operating loss (15,316) (10,486) (29,872) (18,300)
Change in fair value of warrant liability, net 917 5,027 579 10,992
Interest income 4 0 7 1
Other expense and interest expense (117) 0 (115) 0
Net loss (14,512) (5,459) (29,401) (7,307)
Common share data:        
Basic and diluted loss per share (in dollars per share) $ (0.26) $ (0.13) $ (0.57) $ (0.17)
Weighted average number of basic and diluted common shares outstanding (in shares) 54,847,807 42,988,240 51,582,458 42,971,148
Comprehensive loss $ 0 $ (3,000) $ 0 $ (9,000)