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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Costs and expenses:        
Research and development $ 2,044 $ 6,175 $ 4,406 $ 11,618
General and administrative 2,867 3,117 5,593 6,642
Total operating expenses 4,911 9,292 9,999 18,260
Operating loss (4,911) (9,292) (9,999) (18,260)
Other income (expense):        
Litigation settlements (1,300) (1,800) (1,300) (1,800)
Change in fair value of warrants potentially settleable in cash (185) 14,392 3,707 10,520
Interest expense, net (687) (519) (1,660) (611)
Change in fair value of the contingent purchase price liability (19) 5,497 (132) 5,327
Total non-operating income (expense), net (2,191) 17,570 615 13,436
Income (loss) from continuing operations (7,102) 8,278 (9,384) (4,824)
Loss from discontinued operations (1,302) (2,889) (10,738) (6,280)
Net income (loss) $ (8,404) $ 5,389 $ (20,122) $ (11,104)
Net loss per common share:        
Basic net income (loss) per share, continuing operations (in dollars per share) $ (0.19) $ 0.91 $ (0.29) $ (0.13)
Basic net loss per share, discontinued operations (in dollars per share) (0.03) (0.32) (0.34) (0.17)
Basic net income (loss) per share (in dollars per share) $ (0.22) $ 0.59 $ (0.63) $ (0.30)
Weighted-average common shares outstanding, basic (in shares) 37,421,273 9,101,730 31,944,243 9,035,173
Net income (loss) per common share, diluted:        
Diluted net income (loss) per share, continuing operations (in dollars per share) $ (0.19) $ 0.90 $ (0.29) $ (0.13)
Diluted net loss per share, discontinued operations (in dollars per share) (0.03) (0.32) (0.34) (0.17)
Diluted net income (loss) per share (in dollars per share) $ (0.22) $ 0.58 $ (0.63) $ (0.30)
Weighted-average common shares outstanding, diluted (in shares) 37,421,273 9,273,867 31,944,243 9,035,173