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Marketable Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
segment
security
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, amortized cost value $ 258,567 $ 159,678    
Cash and cash equivalents, fair value 258,567 159,678 $ 28,518 $ 12,303
Marketable securities, amortized cost 73,808 313,656    
Available-for-sale securities, gross unrealized gains 78 155    
Available-for-sale securities, gross unrealized losses (6) (150)    
Marketable securities, fair value $ 73,880 $ 313,661    
Available for sale securities in unrealized loss positions 0 0    
Debt securities held in an unrealized loss position for less than 12 months | security 13 57    
Unrealized loss on debt securities in an unrealized loss position for less than 12 months $ 6 $ 150    
Fair value of debt securities in an unrealized loss position for less than 12 months $ 35,700 $ 225,700    
Maximum        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, contractual term to maturity 1 year 1 year    
Domestic corporate commercial paper        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, amortized cost $ 31,852 $ 84,004    
Available-for-sale securities, gross unrealized gains 78 154    
Available-for-sale securities, gross unrealized losses 0 0    
Marketable securities, fair value 31,930 84,158    
Domestic corporate debt securities        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, amortized cost 19,317 173,142    
Available-for-sale securities, gross unrealized gains 0 0    
Available-for-sale securities, gross unrealized losses (2) (107)    
Marketable securities, fair value 19,315 173,035    
Asset-backed securities        
Available-for-sale marketable securities and cash and cash equivalents        
Marketable securities, amortized cost 22,639 56,510    
Available-for-sale securities, gross unrealized gains 0 1    
Available-for-sale securities, gross unrealized losses (4) (43)    
Marketable securities, fair value 22,635 56,468    
Cash        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, amortized cost value 77,443 2,934    
Cash and cash equivalents, fair value 77,443 2,934    
Money market        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, amortized cost value 173,631 83,257    
Cash and cash equivalents, fair value 173,631 83,257    
Domestic corporate commercial paper        
Available-for-sale marketable securities and cash and cash equivalents        
Cash and cash equivalents, amortized cost value 5,487 39,984    
Cash and cash equivalents, fair value 5,487 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 2,006 10,007    
Cash and cash equivalents, fair value $ 2,006 10,007    
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