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Cash, Cash Equivalents and Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Amortized Cost $ 52,526 $ 67,049 $ 69,369 $ 67,979
Investments, Amortized Cost 43,110 43,672    
Investments, Unrealized Gains 9 0    
Investments, Unrealized Losses (5) (101)    
Investments, Fair Value 43,114 43,571    
Cash [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Amortized Cost 44,900 60,200    
Money market funds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Amortized Cost 7,577 6,860    
Cash and Cash Equivalents, Fair Value 7,577 6,860    
US government agency bonds [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investments, Amortized Cost 14,054 13,044    
Investments, Unrealized Gains 3 0    
Investments, Unrealized Losses (1) (38)    
Investments, Fair Value 14,056 13,006    
Corporate bonds and commercial paper [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investments, Amortized Cost 15,676 17,908    
Investments, Unrealized Gains 6 0    
Investments, Unrealized Losses (4) (63)    
Investments, Fair Value 15,678 17,845    
Certificates of Deposit [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Investments, Amortized Cost 13,380 12,720    
Investments, Unrealized Gains 0 0    
Investments, Unrealized Losses 0 0    
Investments, Fair Value $ 13,380 $ 12,720