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Acquired Intangible Assets - Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 9  
2021 9  
2022 9  
2023 9  
2024 1  
Total $ 37 $ 48