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Commitments and Contingencies -Operating Leases (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Operating leases for office space and equipment $ 532 $ 363 $ 1,025 $ 686
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2019 (nine months remaining) 1,182      
2020 2,240      
2021 1,761      
2022 1,592      
2023 1,477      
Thereafter 1,396      
Total $ 9,648