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Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-Sale (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Amortized Cost  
Mature in one year or less $ 117,662
Mature after one year through two years 0
Total amortized cost 117,662
Estimated Fair Value  
Mature in one year or less 117,666
Mature after one year through two years 0
Total estimated fair value $ 117,666