Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 105 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Statements of Operations          
Grant revenue         $ 650
Operating expenses:          
Research and development 3,932 2,220 8,275 9,033 79,682
Acquired in-process research and development         5,500
Selling, general and administrative 3,655 3,525 8,963 8,332 43,862
Total operating expenses 7,587 5,745 17,238 17,365 129,044
Loss from operations (7,587) (5,745) (17,238) (17,365) (128,394)
Interest income 2 2 10 17 679
Interest expense (226) (446) (713) (1,293) (10,115)
Change in fair value of warrants     (12,162)   (13,449)
Loss on debt extinguishment         (799)
Loss before tax benefit (7,811) (6,189) (30,103) (18,641) (152,078)
Income tax benefit         839
Net loss (7,811) (6,189) (30,103) (18,641) (151,239)
Series A Preferred Stock dividends     (314)   (13,564)
Net loss applicable to common stockholders $ (7,811) $ (6,189) $ (30,417) $ (18,641)  
Basic and diluted net loss per common share (in dollars per share) $ (0.25) $ (0.42) $ (1.04) $ (1.26)  
Weighted average basic and diluted common shares outstanding (in shares) 31,468,063 14,752,214 29,360,455 14,740,578