Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Schedule of Future Amortization Related to Intangible Assets (Detail)

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Intangible Assets - Schedule of Future Amortization Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 1,685  
2019 1,390  
2020 1,299  
2021 1,196  
2022 1,142  
Thereafter 4,866  
Net book value $ 11,578 $ 13,404