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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Costs and expenses:        
Research and development $ 6,175 $ 7,197 $ 11,618 $ 13,022
General and administrative 3,117 1,886 6,642 4,973
Total operating expenses 9,292 9,083 18,260 17,995
Operating loss (9,292) (9,083) (18,260) (17,995)
Other income (expense):        
Total settlements (1,800) 0 (1,800) 0
Change in fair value of warrants potentially settleable in cash 14,392 (4,267) 10,520 (3,115)
Interest expense, net (519) (207) (611) (432)
Change In Fair Value Of Contingent Purchase Price Consideration 5,497 83 5,327 (238)
Total non-operating income (expense), net 17,570 (4,391) 13,436 (3,785)
Income (loss) from continuing operations 8,278 (13,474) (4,824) (21,780)
Loss from discontinued operations (2,889) (2,186) (6,280) (4,417)
Net income (loss) $ 5,389 $ (15,660) $ (11,104) $ (26,197)
Net loss per common share:        
Basic and diluted net loss per share, continuing operations (in dollars per share) $ 0.05 $ (0.08) $ (0.03) $ (0.15)
Basic and diluted net loss per share, discontinued operations (in dollars per share) (0.02) (0.02) (0.03) (0.03)
Basic net loss per share (in dollars per share) $ 0.03 $ (0.10) $ (0.06) $ (0.18)
Weighted-average common shares outstanding: basic and diluted 182,034,593 161,383,398 180,703,456 148,647,581
Weighted-average common shares outstanding: diluted (in shares) 185,477,330 161,383,398 180,703,456 148,647,581