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Balance Sheet Components - Property and Equipment (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Land, Property and Equipment      
Total property and equipment at cost $ 961,000   $ 961,000
Accumulated depreciation (420,000)   (404,000)
Property and equipment, net 541,000   557,000
Depreciation and amortization expense 16,000 $ 124,000  
Land      
Land, Property and Equipment      
Total property and equipment at cost 396,000   396,000
Lab equipment      
Land, Property and Equipment      
Total property and equipment at cost 477,000   477,000
Software      
Land, Property and Equipment      
Total property and equipment at cost 63,000   63,000
Furniture and fixtures      
Land, Property and Equipment      
Total property and equipment at cost 18,000   18,000
Computers and peripherals      
Land, Property and Equipment      
Total property and equipment at cost $ 7,000   $ 7,000