Quarterly report pursuant to Section 13 or 15(d)

Acquisitions, Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense for Intangible Assets (Detail)

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Acquisitions, Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Remainder of 2018 $ 88    
2019 340    
2020 327    
2021 245    
2022 184    
Thereafter 269    
Total $ 1,453 $ 0 $ 0