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Balance Sheet Components - Property and Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Land, Property and Equipment          
Total property and equipment at cost $ 1,022,000   $ 1,022,000   $ 948,000
Accumulated depreciation (439,000)   (439,000)   (298,000)
Property and equipment, net 583,000   583,000   650,000
Depreciation and amortization expense 16,000 $ 8,000 141,000 $ 17,000  
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 477,000   477,000   403,000
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
Furniture and fixtures          
Land, Property and Equipment          
Total property and equipment at cost 14,000   14,000   14,000
Computers and peripherals          
Land, Property and Equipment          
Total property and equipment at cost $ 7,000   $ 7,000   $ 7,000