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Maturities of Marketable Securities Available-for-Sale (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Amortized Cost  
Mature in one year or less $ 57,122
Mature after one year through two years 0
Total amortized cost 57,122
Estimated Fair Value  
Mature in one year or less 57,126
Mature after one year through two years 0
Total estimated fair value $ 57,126