Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Schedule of Available-for-sale Investments by Contractual Maturity Date (Details)

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Cash, Cash Equivalents and Investments - Schedule of Available-for-sale Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Adjusted Cost    
Due in one year or less $ 127,629 $ 266,205
Due after one year through three years 6,252 46,655
Total 133,881 312,860
Fair Value    
Due in one year or less 127,615 266,150
Due after one year through three years 6,273 46,369
Total $ 133,888 $ 312,519