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Cash Equivalents and Investments - Schedule of Contractual Maturities of Long-Term Investments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Due after one year through five years $ 55,353 $ 54,959
Due after five years through seven years 3,917 9,123
Total $ 59,270 $ 64,082