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Balance Sheet Components - Property and Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Land, Property and Equipment          
Total property and equipment at cost $ 942,000   $ 942,000   $ 935,000
Accumulated depreciation (245,000)   (245,000)   (225,000)
Property and equipment, net 697,000   697,000   710,000
Depreciation and amortization expense 10,000 $ 15,000 20,000 $ 30,000  
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 418,000   418,000   411,000
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