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Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]    
Remainder of 2019 $ 1,329  
2020 4,436  
2021 4,088  
2022 3,464  
2023 3,313  
Thereafter 12,483  
Net Value $ 29,113 $ 33,183