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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets Estimated Future Amortization Expense (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2019 (remaining nine months) $ 416
2020 555
2021 555
2022 555
2023 555
2024 $ 555