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Commitments and Contingencies - Topic 840 Aggregate Future Minimum Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 1,002
2020 1,002
2021 1,031
2022 1,044
2023 and thereafter 1,920
Total Minimum Lease Payments $ 5,999