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Intangible Assets, Net - Schedule of Estimated Future Amortization Expenses for Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 2,955  
2020 5,879  
2021 5,861  
2022 5,856  
2023 5,843  
Thereafter 59,612  
Total intangible assets, net $ 86,006 $ 88,914