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Basis of Presentation and Summary of Significant Accounting Policies - Estimated Future Amortization for Lease Liabilities (Details)
$ in Thousands
Jan. 01, 2019
USD ($)
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]  
2019 $ 1,996
2020 1,854
2021 1,571
2022 1,422
2023 $ 1,133