Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Information (Narrative) (Details)

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Balance Sheet Information (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 48,000 $ 30,000 $ 93,000 $ 55,000  
Equipment, Furniture And Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Deposits $ 525,000   $ 525,000   $ 276,000