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Major Customer and Geographic Information (Non-affiliated Customers with Accounts Receivable) (Details) - Accounts Receivable [Member]
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Customer A [Member]    
Concentration Risk [Line Items]    
Risk percentage 25.00% 26.00%
Customer B [Member]    
Concentration Risk [Line Items]    
Risk percentage 65.00% 67.00%