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Commitments and Contingencies (Details 3) (USD $)
 12 Months Ended 209 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Apr. 30, 2013
Celgene Corporation
Definitive Agreement
Preferred Dividends        
Dividend rate (as a percent) 6.00%      
Accrued and unpaid dividends in arrears on preferred stock $ 600,000 $ 2,300,000    
Accrued and unpaid dividends in arrears on preferred stock per share (in dollars per share) $ 1.90 $ 1.90    
Commitments And Contingencies [Line Items]        
One-time payment received for patent related uses       5,500,000
Gain on sale of patents $ 5,500,000   $ 5,500,000