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Commitments and Contingencies - Future Annual Minimum Rental Payments Payable (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2020 $ 1,699
2021 2,166
2022 1,784
2023 1,554
2024 1,153
Thereafter 36
Total $ 8,392