Annual report pursuant to Section 13 and 15(d)

Customer Concentration - Schedule of Customer Concentration (Details)

v3.20.4
Customer Concentration - Schedule of Customer Concentration (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Customer A [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 16.00% 18.00%
Customer A [Member] | Accounts Receivable, Net and Contract Assets, Net from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 13.00%  
Customer B [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00% 10.00% 14.00%
Customer B [Member] | Accounts Receivable, Net and Contract Assets, Net from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00%    
Customer C [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 10.00% 11.00% 19.00%
Customer C [Member] | Accounts Receivable, Net and Contract Assets, Net from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   13.00%  
Customer D [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 10.00% 11.00% 13.00%