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Cash, Money Market Funds and Marketable Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Cash, Money Market Funds, and Marketable Securities        
Cash and cash equivalents, Amortized Cost $ 64,133 $ 187,026 $ 33,115 $ 69,485
Cash and cash equivalents, Fair Value 64,133 187,026    
Marketable securities, Amortized Cost 362,598 143,222    
Gross Unrealized Gain 16 134    
Gross Unrealized Loss (117) (31)    
Marketable securities, Fair Value 362,497 143,325    
Cash and marketable securities, Amortized Cost 426,731 330,248    
Cash and marketable securities, Fair Value 426,630 330,351    
Available-for-sale investments        
Realized gain (loss) on securities available-for-sale 0 0    
Fair value of available for sale securities in unrealized loss positions 241,500 58,700    
Other current liabilities        
Cash, Money Market Funds, and Marketable Securities        
Derivative liabilities 0 300    
Other current liabilities | Foreign exchange forward contract | Not designated        
Cash, Money Market Funds, and Marketable Securities        
Derivative liabilities 0      
Other expense | Foreign exchange forward contract | Not designated        
Cash, Money Market Funds, and Marketable Securities        
Gain (loss) on derivative instruments (200)      
Corporate debt securities, current portion        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 192,851 74,564    
Gross Unrealized Gain 5 2    
Gross Unrealized Loss (75) (31)    
Marketable securities, Fair Value 192,781 74,535    
Corporate debt securities, non-current portion        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 15,121      
Gross Unrealized Loss (12)      
Marketable securities, Fair Value 15,109      
Commercial paper        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 123,880 68,258    
Gross Unrealized Gain 11 132    
Gross Unrealized Loss (10)      
Marketable securities, Fair Value 123,881 68,390    
Asset-backed securities        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 30,346      
Gross Unrealized Loss (20)      
Marketable securities, Fair Value 30,326      
Money market        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 350 350    
Marketable securities, Fair Value 350 350    
Certificate of deposit        
Cash, Money Market Funds, and Marketable Securities        
Marketable securities, Amortized Cost 50 50    
Marketable securities, Fair Value $ 50 $ 50