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Commitments and Contingencies - Minimum Future Rental Payments on Non-cancelable Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 1,222
2020 1,222
2021 1,222
2022 1,222
2023 1,222
Thereafter 55,689
Total $ 61,799