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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Balance Sheet Components          
Depreciation and amortization expense $ 32,000 $ 31,000 $ 65,000 $ 60,000  
Property and equipment, gross 718,000   718,000   $ 829,000
Accumulated depreciation 626,000   626,000   $ 655,000
Finance lease          
Balance Sheet Components          
Property and equipment, gross 72,000   72,000    
Accumulated depreciation $ 68,000   $ 68,000