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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Unrecognized tax benefits that would impact effective tax rate $ 7,600    
Valuation allowance, change in amount 230,700 $ 9,800 $ 5,400
Liability for uncertain tax positions 29 32  
Realization Of Excess Tax Benefits From Share Based Compensation      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets not recognized related to share-based compensation 11,500 8,100  
Valuation allowance, change in amount (4,200)    
Other Comprehensive Income (Loss) [Member]      
Operating Loss Carryforwards [Line Items]      
Valuation allowance, change in amount 0 (700) (1,000)
Allocated to Equity      
Operating Loss Carryforwards [Line Items]      
Valuation allowance, change in amount 0 $ (1,100) $ 0
Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward 10,600    
California and New Jersey Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward 14,100    
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforward 537,100    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforward $ 138,400