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Intangible Assets - Summary of Estimated Future Amortization for Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2019 $ 1,490
2020 1,300
2021 1,299
2022 1,298
2023 1,297
Total $ 6,684