Annual report pursuant to Section 13 and 15(d)

Industry, Segment, and Geographic Financial Information - Concentration (Details)

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Industry, Segment, and Geographic Financial Information - Concentration (Details) - customer
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Top five customers    
Significant Customers and Vendors    
Number of customers 5 5
Net sales | Customer concentration risk    
Significant Customers and Vendors    
Number of customers 2  
Net sales | SHI | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 16.00% 17.00%
Net sales | CDW | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk   26.00%
Net sales | Top five customers    
Significant Customers and Vendors    
Percentage of concentration risk 56.00% 55.00%
Net accounts receivable | SHI | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 12.00% 15.00%
Net accounts receivable | CDW | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 43.00% 36.00%
Purchases | Vendor concentration risk | SolarWinds    
Significant Customers and Vendors    
Percentage of concentration risk 17.00% 15.00%
Purchases | Vendor concentration risk | Sophos    
Significant Customers and Vendors    
Percentage of concentration risk 22.00% 24.00%