Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets, Net - Summary of Future Estimated Annual Amortization Expense (Detail)

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Goodwill and Intangible Assets, Net - Summary of Future Estimated Annual Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
2018 (3 months) $ 317  
2019 1,337  
2020 1,194  
2021 125  
Intangible assets, net $ 2,973 $ 3,154