Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Additional Information (Details)

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Balance Sheet Components - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Depreciation and amortization expense $ 20,000 $ 15,000 $ 39,000 $ 29,000  
Property and equipment, gross 1,057,000   1,057,000   $ 1,021,000
Accumulated Depreciation 918,000   918,000   $ 879,000
Capital lease          
Property and equipment, gross 72,000   72,000    
Accumulated Depreciation $ 20,000   $ 20,000