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Maturities of Marketable Securities Available-for-Sale (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
Amortized Cost  
Mature in one year or less $ 89,328
Mature after one year through two years 0
Total amortized cost 89,328
Estimated Fair Value  
Mature in one year or less 89,286
Mature after one year through two years 0
Total estimated fair value $ 89,286