Quarterly report pursuant to Section 13 or 15(d)

Customer Concentration (Details)

v3.19.2
Customer Concentration (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Customer A [Member] | Total Revenues from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 17.00% 21.00% 18.00% 19.00%  
Customer A [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     11.00%   21.00%
Customer B [Member] | Total Revenues from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 11.00% 17.00% 11.00% 14.00%  
Customer B [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     15.00%   14.00%
Customer C [Member] | Total Revenues from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 11.00% 18.00% 12.00% 22.00%  
Customer C [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     15.00%   18.00%
Customer D [Member] | Total Revenues from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 12.00% 16.00% 13.00% 11.00%  
Customer D [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     14.00%    
Customer E [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     13.00%    
Customer F [Member] | Accounts Receivable from External Customers [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage         10.00%