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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Net revenue $ 2,487 $ 0 $ 0
Costs and expenses:      
Cost of Revenue 520 0 0
Research and development 21,076 14,614 3,851
Selling, general and administrative 14,600 6,585 8,635
Amortization of certain acquired intangible assets 131 0 0
Total costs and expenses 36,327 21,199 12,486
Operating loss (33,840) (21,199) (12,486)
Non-operating income (expense):      
Interest income (expense), net (807) (33) (7)
Other income (expense) (40,979) (13,145) 9,086
Total non-operating income (expense), net (41,786) (13,178) 9,079
Loss from continuing operations before income taxes (75,626) (34,377) (3,407)
Income tax expense (benefit) 1,052 (1,052)   
Loss from continuing operations (76,678) (33,325) (3,407)
Loss from discontinued operations 0 (1,644) (8,078)
Net loss (76,678) (34,969) (11,485)
Net loss per common share:      
Basic and diluted per share, continuing operations (usd per share) $ (0.85) $ (0.53) $ (0.09)
Basic and diluted loss per share, discontinued operations (usd per share) $ 0 $ (0.03) $ (0.22)
Basic and diluted net loss per share (usd per share) $ (0.85) $ (0.56) $ (0.32)
Weighted-average common shares outstanding: basic and diluted 90,181,501 62,480,666 36,334,413
Comprehensive loss      
Net loss (76,678) (34,969) (11,485)
Reclassification of unrealized gain upon sale of marketable securities (2,678) 0 0
Unrealized gain on marketable securities    2,678   
Tax effect of reclassification of unrealized gain upon sale of marketable securities 1,052 0 0
Tax effect of unrealized gain on marketable securities 0 (1,052) 0
Total comprehensive loss $ (78,304) $ (33,343) $ (11,485)