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Consolidated Statements of Operations and Comprehensive Loss (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 144 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Costs and expenses:      
Research and development $ 2,928 $ 1,092 $ 45,605
General and administrative 4,012 3,227 46,595
Merger transaction costs     5,470
Restructuring expense, net     2,413
Loss on impairment of in-process research and development     6,000
Total costs and expenses 6,940 4,319 106,083
Loss from operations (6,940) (4,319) (106,083)
Gain on assignment of patent rights     2,000
Gain on bargain purchase     25,282
Interest and other income 5 2 2,033
Interest and other expense (4) (3) (446)
Loss before income taxes (6,939) (4,320) (77,214)
Benefit from income taxes       2,281
Net loss and comprehensive loss (6,939) (4,320) (74,933)
Less: Accretion of redeemable convertible preferred stock     (245)
Less: Deemed preferred stock dividend (2,026)   (2,807)
Net loss available to common stockholders $ (8,965) $ (4,320) $ (77,985)
Net loss available to common stockholders per share:      
Basic and diluted $ (1.04) $ (1.94)  
Weighted average shares outstanding:      
Basic and diluted 8,629,479 2,223,516