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Selected Balance Sheet Information - Schedule of Property and equipment, net (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Selected Balance Sheet Information    
Total property and equipment, gross $ 1,205,000 $ 1,424,000
Less: accumulated depreciation and amortization (935,000) (1,002,000)
Total property and equipment, net 270,000 422,000
Depreciation 137,000 135,000
Computers and office equipment    
Selected Balance Sheet Information    
Total property and equipment, gross 708,000 902,000
Other property, plant and equipment    
Selected Balance Sheet Information    
Total property and equipment, gross 392,000 417,000
Leasehold improvements    
Selected Balance Sheet Information    
Total property and equipment, gross 94,000 94,000
Software    
Selected Balance Sheet Information    
Total property and equipment, gross $ 11,000 $ 11,000