Property, Plant and Equipment, net (Details) - Property, plant and equipment - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 2,946,000	$ 2,946,000
Less accumulated depreciation	811,000	746,000
Net property, plant and equipment	2,135,000	2,200,000
Machinery Fixture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,923,000	2,923,000
Leaseholds and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 23,000	$ 23,000