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Income Tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 0 $ 0 $ 0
State and local 11,000 8,000 8,000
Foreign 0 0 0
Current 11,000 8,000 8,000
Deferred:      
Federal 0 0 0
State and local 0 0 0
Foreign (139,000) (984,000) 1,123,000
Income tax expense (benefit) $ (128,000) $ (976,000) $ 1,131,000