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Intangible Assets and Goodwill - Schedule of Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 18,201  
2020 36,402  
2021 36,401  
2022 36,402  
2023 36,401  
Thereafter 145,606  
Total $ 309,413 $ 328,153