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Selling and marketing expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Selling and marketing expenses        
Advertising costs $ (33,775) $ (90,190) $ (88,926) $ (154,634)
Employee benefits expenses (1,252) (555) (2,395) (838)
Selling and marketing expenses $ (35,027) $ (90,745) $ (91,321) $ (155,472)