XML 66 R55.htm IDEA: XBRL DOCUMENT v3.21.2
Segment Information (Details) - Customer concentration risk - Accounts receivable
Sep. 30, 2021
Dec. 31, 2020
Customer 1    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 18.00%  
Customer 2    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 14.00%  
Customer 3    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable 10.00% 13.00%
Customer 4    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable   14.00%
Customer 5    
Concentration risk    
Accounts receivable from major customer as a percentage of total accounts receivable   11.00%