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Property, Plant and Equipment, net (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment, net (Details) [Line Items]          
Depreciation $ 56,000 $ 59,000 $ 187,000 $ 194,000  
Machinery Fixture And Equipment [Member]          
Property, Plant and Equipment, net (Details) [Line Items]          
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position $ 2,000,000   $ 2,000,000   $ 2,200,000