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Goodwill and Intangible Assets, Net - Schedule of Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 213  
2019 213  
2020 213  
2021 213  
2022 106  
Net $ 958 $ 1,871