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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]    
Finite-Lived Intangible Assets, Gross $ 35,640 $ 27,000
Finite-Lived Intangible Assets, Net $ 15,315 $ 12,207