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Available-for-Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]    
One year or less, amortized cost $ 40,252 $ 54,131
Marketable equity securities, amortized cost 0 0
Amortized Cost 40,252 54,131
One year or less, fair value 40,224 54,107
Marketable equity securities, fair value 3,710 3,952
Total available-for-sale securities fair value $ 43,934 $ 58,059