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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Income tax provision $ 0 $ 0 $ 0
Percentage of valuation allowance against deferred tax assets 100.00%    
Valuation allowance $ 2,649,000 886,000 $ 7,683,000
Tax benefit related to the exercise of non qualified stock options 1,000,000    
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 184,500,000 171,600,000  
Operating loss carryforwards, amount subject to limitations 8,600,000    
Operating loss carryforwards, annual limitation 123,000    
Operating loss carryforwards, net of limitations $ 175,900,000    
State and City [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, expiration dates 2035    
Foreign [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 22,100,000 21,800,000  
Federal Research and Development Tax Credit Carryforwards [Member]      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards $ 3,800,000 3,600,000  
Tax credit carryforwards, expiration dates 2035    
Minimum [Member] | State and City [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 27,300,000 110,500,000  
Maximum [Member] | State and City [Member]      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 109,700,000 $ 276,300,000