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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash, Cash Equivalents and Investments        
Document Period End Date Dec. 31, 2016      
Total cash and cash equivalents $ 199,944 $ 334,667 $ 175,957 $ 245,755
Total short-term investments 37,109 35,844    
Total long-term investments 6,252 46,369    
Total cash, cash equivalents and investments 243,305 416,880    
Cash        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 144,192 104,361    
Money market funds        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 55,752 180,021    
Commercial paper        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 0 31,089    
Total short-term investments 0 4,792    
Corporate debt securities        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents 0 2,000    
Total short-term investments 37,109 31,052    
Total long-term investments 6,252 46,369    
U.S. government and government agency debt securities        
Cash, Cash Equivalents and Investments        
Total cash and cash equivalents $ 0 $ 17,196