Selected Balance Sheet Information - Schedule of Property and equipment, net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Selected Balance Sheet Information
Total property and equipment, gross	$ 1,188,000	$ 1,205,000
Less: accumulated depreciation and amortization	(966,000)	(935,000)
Total property and equipment, net	222,000	270,000
Depreciation expense	108,000	137,000
Computers and office equipment
Selected Balance Sheet Information
Total property and equipment, gross	639,000	708,000
Other property, plant and equipment
Selected Balance Sheet Information
Total property and equipment, gross	444,000	392,000
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