Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions - Schedule of cash, cash equivalents and investments (Details)

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Composition of Certain Financial Statement Captions - Schedule of cash, cash equivalents and investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents $ 334,667 $ 175,957 $ 245,755 $ 65,725
Total short-term investments 35,844 178,631    
Total long-term investments 46,369 104,243    
Total cash, cash equivalents and investments 416,880 458,831    
Cash        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 104,361 72,487    
Money market funds        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 180,021 89,113    
Commercial paper        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 31,089 9,349    
Total short-term investments 4,792 45,443    
Corporate debt securities        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 2,000 5,008    
Total short-term investments 31,052 128,691    
Total long-term investments 46,369 100,998    
U.S. government and government agency debt securities        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 17,196 0    
Total short-term investments 0 4,497    
Total long-term investments $ 0 $ 3,245