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Marketable Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value $ 159,678 $ 28,518 $ 12,303 $ 18,653
Debt securities held in an unrealized loss position for more than 12 months | item 0 0    
Debt securities held in an unrealized loss position for less than 12 months | item 57 34    
Fair value of debt securities in an unrealized loss position for less than 12 months $ 225,700 $ 68,900    
Unrealized loss on debt securities in an unrealized loss position for less than 12 months $ 150 $ 34    
Maximum        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, contractual term to maturity 1 year 1 year    
Available-for-sale marketable securities        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, Amortized Cost $ 313,656 $ 76,779    
Marketable securities, Gross Unrealized Gains 155 12    
Marketable securities, Gross Unrealized Losses (150) (33)    
Marketable securities, Fair Value 313,661 76,758    
Domestic corporate debt securities        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, Amortized Cost 173,142 69,542    
Marketable securities, Gross Unrealized Losses (107) (33)    
Marketable securities, Fair Value 173,035 69,509    
Domestic corporate commercial paper        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, Amortized Cost 84,004 7,237    
Marketable securities, Gross Unrealized Gains 154 12    
Marketable securities, Fair Value 84,158 7,249    
Asset-backed Securities        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, Amortized Cost 56,510      
Marketable securities, Gross Unrealized Gains 1      
Marketable securities, Gross Unrealized Losses (43)      
Marketable securities, Fair Value 56,468      
Cash and Cash Equivalents        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 159,678 28,518    
Cash and cash equivalents, Fair Value 159,678 28,518    
Cash        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 2,934 1,519    
Cash and cash equivalents, Fair Value 2,934 1,519    
Money market        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 83,257 23,994    
Cash and cash equivalents, Fair Value 83,257 23,994    
Domestic corporate commercial paper        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 39,984      
Cash and cash equivalents, Fair Value 39,984      
Government-sponsored enterprise debt securities        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 15,996      
Cash and cash equivalents, Fair Value 15,996      
Domestic corporate debt securities        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 10,007 3,005    
Cash and cash equivalents, Fair Value 10,007 $ 3,005    
Asset-backed Securities        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, Amortized Cost Value 7,500      
Cash and cash equivalents, Fair Value $ 7,500