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Consolidated Statements of Operations and Comprehensive Loss (unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 138 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Costs and expenses:          
Research and development $ 246 $ 322 $ 427 $ 744 $ 43,104
Selling, general and administrative 952 823 1,841 1,807 44,424
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 1,198 1,145 2,268 2,551 101,411
Loss from operations (1,198) (1,145) (2,268) (2,551) (101,411)
Gain on assignment of patent rights         2,000
Gain on bargain purchase         25,282
Interest and other income 1 1 1 1 2,029
Interest and other expense (2) (2) (3) (3) (445)
Loss before income taxes (1,199) (1,146) (2,270) (2,553) (72,545)
Benefit from income taxes         2,281
Net loss and comprehensive loss (1,199) (1,146) (2,270) (2,553) (70,264)
Less: Accretion of redeemable convertible preferred stock         (245)
Less: Deemed preferred stock dividend (2,026)   (2,026)   (2,807)
Net loss attributable to common stockholders $ (3,225) $ (1,146) $ (4,296) $ (2,553) $ (73,316)
Net loss attributable to common stockholders per share:          
Basic and diluted $ (0.65) $ (0.57) $ (1.08) $ (1.26)  
Weighted average shares outstanding:          
Basic and diluted 4,944,149 2,027,716 3,995,921 2,027,716