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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 9,525  
2020 12,427  
2021 8,886  
2022 8,049  
2023 3,967  
2024 and thereafter 16,205  
Total $ 59,059 $ 61,812