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Property and Equipment (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Property and equipment, gross $ 898,000 $ 4,238,000
Accumulated depreciation and amortization (785,000) (4,163,000)
Property and equipment, net 113,000 75,000
Production Tooling, Machinery and Equipment    
Property and equipment, gross 27,000 2,349,000
Office Furniture And Fixtures    
Property and equipment, gross 95,000 425,000
Computer Equipment and Software    
Property and equipment, gross 753,000 1,447,000
Leasehold Improvements    
Property and equipment, gross 19,000 0
Construction in Progress    
Property and equipment, gross $ 4,000 $ 17,000