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 27.00% 28.00% 39.00%
Customer A [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 21.00% 35.00%  
Customer B [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 18.00% 21.00% 27.00%
Customer B [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00% 23.00%  
Customer C [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 19.00% 23.00% 23.00%
Customer C [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 22.00% 30.00%  
Customer D [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 20.00% 19.00% 0.00%
Customer D [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00% 8.00%  
Customer E [Member] | Total Revenues from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   0.00% 0.00%
Customer E [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 13.00% 0.00%  
Customer F [Member] | Accounts Receivable from External Customers [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 14.00% 0.00%