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Summary of Significant Accounting Policies (Schedule of Concentration of Credit Risk, Percentage of Total Revenues) (Details) - Sales Revenue, Goods, Net [Member]
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Customer A [Member]    
Summary of concentration of credit risk, customer as a percentage of total revenues    
Concentration risk percentage 32.00% 31.00%
Customer B [Member]    
Summary of concentration of credit risk, customer as a percentage of total revenues    
Concentration risk percentage 22.00% 41.00%
Customer C [Member]    
Summary of concentration of credit risk, customer as a percentage of total revenues    
Concentration risk percentage 15.00% [1]
Customer D [Member]    
Summary of concentration of credit risk, customer as a percentage of total revenues    
Concentration risk percentage 13.00% 22.00%
[1] Amounts are less than 10%