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Accrued Expenses (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses [Abstract]    
Accrued compensation $ 656,000 $ 294,000
Accrued research and development expenses 222,000 207,000
Accrued general and administrative expenses 371,000 400,000
Accrued interest 0 150,000
Total accrued expenses $ 1,249,000 $ 1,051,000