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Segment Information (Details 2) - Customer concentration risk - Revenue
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Customer A        
Concentration Risk        
Revenue from major customer as a percentage of total revenue 18.00% 11.00% 16.00% 11.00%
Customer B        
Concentration Risk        
Revenue from major customer as a percentage of total revenue 15.00%   14.00%  
Customer C        
Concentration Risk        
Revenue from major customer as a percentage of total revenue   15.00%    
Customer D        
Concentration Risk        
Revenue from major customer as a percentage of total revenue   14.00%   15.00%