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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]      
Valuation allowance, change in amount $ (5.4) $ 41.8 $ (15.4)
Unrecognized tax benefits that would impact deferred tax assets and valuation allowance, and not impact effective tax rate 8.5    
Research Tax Credit Carryforward
      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward 18.6    
California and New Jersey Research Tax Credit Carryforward
      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward 13.9    
Internal Revenue Service (IRS)
      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforward 555.5    
State and Local Jurisdiction
      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforward 173.3    
Realization Of Excess Tax Benefits From Share Based Compensation
      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Excess Tax Benefits From Share Based Compensation, Amount Not Realized 2.4 0.9  
Valuation allowance, change in amount $ 1.0 $ 0 $ 0.1