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Balance Sheet Components - Property and Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Land, Property and Equipment          
Total property and equipment at cost $ 948,000   $ 948,000   $ 942,000
Accumulated depreciation (282,000)   (282,000)   (265,000)
Property and equipment, net 666,000   666,000   677,000
Depreciation and amortization expense 8,000 $ 10,000 17,000 $ 20,000  
Land          
Land, Property and Equipment          
Total property and equipment at cost 396,000   396,000   396,000
Lab equipment          
Land, Property and Equipment          
Total property and equipment at cost 424,000   424,000   418,000
Clinical equipment          
Land, Property and Equipment          
Total property and equipment at cost 65,000   65,000   65,000
Software          
Land, Property and Equipment          
Total property and equipment at cost $ 63,000   $ 63,000   $ 63,000