Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Schedule of Cash, Cash Equivalents and Investments (Details)

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Cash, Cash Equivalents and Investments - Schedule of Cash, Cash Equivalents and Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Cash, Cash Equivalents and Investments    
Cash and cash equivalents $ 287,523 $ 499,597
Short-term investments 100,119 1,250
Cash, cash equivalents and investments 387,642 500,847
Cash    
Cash, Cash Equivalents and Investments    
Cash and cash equivalents 134,862 146,294
Money market funds    
Cash, Cash Equivalents and Investments    
Cash and cash equivalents 51,273 353,303
Commercial paper    
Cash, Cash Equivalents and Investments    
Cash and cash equivalents 89,387 0
Certificates of deposit    
Cash, Cash Equivalents and Investments    
Cash and cash equivalents 7,504 0
U.S. government and government agency debt securities    
Cash, Cash Equivalents and Investments    
Cash and cash equivalents 4,497 0
Commercial paper    
Cash, Cash Equivalents and Investments    
Short-term investments 80,915 0
Corporate debt securities    
Cash, Cash Equivalents and Investments    
Short-term investments $ 19,204 $ 1,250