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Purchased Intangible Assets - Schedule of Finite-Lived Intangible Assets, Annual Expected Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 1,354  
2019 1,354  
2020 1,179  
2021 1,179  
2022 1,072  
Thereafter 1,314  
Net carrying amount $ 7,452 $ 8,324