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Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Accrued research and development $ 2,310,000 $ 781,000
Accrued legal and professional fees 233,000 325,000
Other current liabilities 634,000 866,000
Accrued and other current liabilities $ 3,177,000 1,972,000
Other Current Liabilities [Member]    
Other current liabilities   $ 80,000