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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair Value of Financial Instruments        
Money Market Funds $ 57,738 $ 54,649 $ 60,923 $ 77,975
Total Fair Value 149,742      
Money Market Funds        
Fair Value of Financial Instruments        
Money Market Funds 9,904      
Corporate Securities        
Fair Value of Financial Instruments        
Securities 88,651      
Government Securities        
Fair Value of Financial Instruments        
Securities 51,187      
Level 1        
Fair Value of Financial Instruments        
Total Fair Value 9,904      
Level 1 | Money Market Funds        
Fair Value of Financial Instruments        
Money Market Funds 9,904      
Level 2        
Fair Value of Financial Instruments        
Total Fair Value 139,838      
Level 2 | Corporate Securities        
Fair Value of Financial Instruments        
Securities 88,651      
Level 2 | Government Securities        
Fair Value of Financial Instruments        
Securities $ 51,187