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
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Balance Sheet Components      
Depreciation and amortization expense $ 33,000 $ 29,000  
Property and equipment, gross 843,000   $ 829,000
Accumulated depreciation 688,000   $ 655,000
Finance lease      
Balance Sheet Components      
Property and equipment, gross 72,000    
Accumulated depreciation $ 62,000