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Intangible assets, net - Schedule of Estimated Amortization Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 6,394  
2020 12,637  
2021 9,231  
2022 8,148  
2023 3,967  
2024 and thereafter 16,206  
Total $ 56,583 $ 61,812