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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]    
One year or less, amortized cost $ 54,131 $ 85,049
Marketable equity securities, amortized cost 0 0
Amortized Cost 54,131 85,049
One year or less, fair value 54,107 85,000
Marketable equity securities, fair value 3,952 11,163
Total available-for-sale securities fair value $ 58,059 $ 96,163