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Cash Equivalents and Investments - Schedule of Contractual Maturities of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Due after one year through five years $ 79,718 $ 70,005
Due after five years through seven years 6,568 8,970
Total $ 86,286 $ 78,975