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Segment Reporting - Major Customer (Details) - Net sales - Customer Concentration Risk - item
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Major Customers    
Number of customers 2 1
Major Customer Number One    
Major Customers    
Concentration risk (as a percent) 15.00% 18.00%
Major Customer Number Two    
Major Customers    
Concentration risk (as a percent) 14.00%