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Industry and Geographic Information - Sales to Individual Customers in Excess of 10% of Total Revenues (Details) - Sales - Customer Concentration Risk
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue, Major Customer [Line Items]    
Sales percentage 60.00% 54.00%
Customer One [Member]    
Revenue, Major Customer [Line Items]    
Sales percentage 21.00% 17.00%
Customer B    
Revenue, Major Customer [Line Items]    
Sales percentage 19.00% 17.00%
Customer C    
Revenue, Major Customer [Line Items]    
Sales percentage 10.00% 7.00%
Customer D    
Revenue, Major Customer [Line Items]    
Sales percentage 10.00% 13.00%