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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ (6,352) $ (3,532) $ (28,150) $ (22,017)
Costs and expenses:        
Research and development 5,740 7,025 18,762 21,463
General and administrative 2,895 3,542 7,869 12,744
Total operating expenses 8,635 10,567 26,631 34,207
Operating loss (8,635) (10,567) (26,631) (34,207)
Other income (expense):        
Change in fair value of warrants potentially settleable in cash 2,134 6,735 (981) 13,174
Interest income (expense), net (158) (297) (607) (925)
Other income (expense) 307 597 69 (59)
Total non-operating income (expense), net 2,283 7,035 (1,519) 12,190
Loss from discontinued operations, including $8,071 impairment charge from classification as held for sale for three and nine months ended September 30, 2015 (11,674) (2,641) (16,074) (6,633)
Net loss $ (18,026) $ (6,173) $ (44,224) $ (28,650)
Net loss per common share:        
Basic and diluted net loss per share, continuing operations (in dollars per share) $ (0.04) $ (0.03) $ (0.18) $ (0.19)
Basic and diluted net loss per share, discontinued operations (in dollars per share) (0.07) (0.02) (0.11) (0.06)
Basic net loss per share (in dollars per share) $ (110.00) $ (0.05) $ (0.29) $ (0.25)
Weighted-average common shares outstanding: basic and diluted 161,857,522 119,038,656 153,000,857 117,767,791