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Balance Sheet Information (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 39,000 $ 21,000 $ 94,000 $ 75,000  
Equipment, Furniture And Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Deposit assets $ 171,000   $ 171,000   $ 210,000