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Major Customer and Geographic Information (Schedule of Revenues from Non-affiliated Customers) (Details) - Revenue [Member]
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Customer A [Member]    
Revenue, Major Customer [Line Items]    
Risk percentage 67.00% 43.00%
Customer B [Member]    
Revenue, Major Customer [Line Items]    
Risk percentage 0.00% 21.00%
Customer C [Member]    
Revenue, Major Customer [Line Items]    
Risk percentage 19.00% 19.00%