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Goodwill and Intangible Assets - Summary of Estimated Future Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 2,998  
2020 2,998  
2021 2,794  
2022 2,794  
2023 2,794  
Thereafter 14,052  
Net Carrying Amount 28,430 $ 33,139
Cost of Product [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 1,925  
2020 1,925  
2021 1,878  
2022 1,878  
2023 1,878  
Thereafter 7,643  
Net Carrying Amount 17,127  
Sales and marketing [Member]    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 1,073  
2020 1,073  
2021 916  
2022 916  
2023 916  
Thereafter 6,409  
Net Carrying Amount $ 11,303