Annual report pursuant to Section 13 and 15(d)

Customer Concentration (Details)

v3.19.3.a.u2
Customer Concentration (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Customer A [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 16.00% 18.00% 24.00%
Customer A [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00% 21.00%  
Customer B [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 10.00% 14.00% 14.00%
Customer B [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   14.00%  
Customer C [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 11.00% 19.00% 14.00%
Customer C [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00% 18.00%  
Customer D [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 11.00% 13.00%  
Customer E [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage     17.00%
Customer E [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 0.00% 0.00%  
Customer F [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 0.00% 10.00%