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Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Future expected amortization of intangible assets    
Remainder of 2020 $ 670  
2021 1,335  
2022 1,327  
2023 1,183  
2024 645  
2025 and thereafter 257  
Total $ 5,417 $ 6,043