Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Industry, Segment, and Geographic Financial Information - Concentration (Details) - customer
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 14.00% 16.00%
Net sales | CDW | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 24.00% 26.00%
Net sales | Top five customers    
Significant Customers and Vendors    
Percentage of concentration risk 52.00% 56.00%
Net accounts receivable | SHI | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 9.00% 12.00%
Net accounts receivable | CDW | Customer concentration risk    
Significant Customers and Vendors    
Percentage of concentration risk 19.00% 43.00%
Purchases | Vendor concentration risk | SolarWinds    
Significant Customers and Vendors    
Percentage of concentration risk 12.00% 17.00%
Purchases | Vendor concentration risk | Sophos    
Significant Customers and Vendors    
Percentage of concentration risk 20.00% 22.00%