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Commitments and Contingencies -Operating Leases (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Operating leases for office space and equipment $ 675 $ 532 $ 1,416 $ 1,025
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
2020 (six months remaining) 1,290      
2021 2,642      
2022 2,299      
2023 2,165      
2024 1,659      
Thereafter 3,835      
Total $ 13,890