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Segment Information (Details) - Customer concentration risk - Accounts receivable
Jun. 30, 2021
Dec. 31, 2020
Customer 1    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 13.00% 13.00%
Customer 2    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 11.00%  
Customer 3    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 10.00% 14.00%
Customer 4    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable   11.00%