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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Future expected amortization of intangible assets    
2020 $ 1,336  
2021 1,331  
2022 1,322  
2023 1,178  
2024 640  
2025 and after 236  
Net Carrying Amount $ 6,043 $ 7,366