Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components (Details)

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Balance Sheet Components (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Balance Sheet Components          
Depreciation and amortization expense $ 18,000 $ 31,000 $ 82,000 $ 91,000  
Property and equipment, gross 752,000   752,000   $ 829,000
Accumulated depreciation 643,000   643,000   $ 655,000
Finance lease          
Balance Sheet Components          
Property and equipment, gross 72,000   72,000    
Accumulated depreciation $ 72,000   $ 72,000