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Consolidated Statements of Operations and Comprehensive Loss (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 147 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Costs and expenses:      
Research and development $ 1,308 $ 181 $ 46,913
Selling, general and administrative 1,082 889 47,677
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 2,390 1,070 108,473
Loss from operations (2,390) (1,070) (108,473)
Gain on assignment of patent rights     2,000
Gain on bargain purchase     25,282
Interest and other income 2   2,035
Interest and other expense (1) (1) (447)
Loss before income taxes (2,389) (1,071) (79,603)
Benefit from income taxes     2,281
Net loss and comprehensive loss (2,389) (1,071) (77,322)
Less: Accretion of redeemable convertible preferred stock     (245)
Less: Deemed preferred stock dividend     (2,807)
Net loss available to common stockholders $ (2,389) $ (1,071) $ (80,374)
Net loss available to common stockholders per share:      
Basic and diluted $ (0.13) $ (0.35)  
Weighted average shares outstanding:      
Basic and diluted 18,785,418 3,034,763