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Amortization Expense for Amortized Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
December 31, 2016 (three months remaining) $ 553
December 31, 2017 2,211
December 31, 2018 2,022
December 31, 2019 1,999
December 31, 2020 1,666
December 31, 2021 $ 1,358