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Segment reporting - Major customers (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Geographical information        
Number of major customers     2  
Customer A        
Geographical information        
Revenue percentage 63.00% 65.00% 63.00% 66.00%
Customer B        
Geographical information        
Revenue percentage 17.00% 15.00% 17.00% 14.00%