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Certain risks and concentration - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase in net cash used in operating activities $ 19,480 $ (13,911) $ (45,649)
Increase in net cash used in investing activities (32,619) (20,756) 79,260
Increase in net cash used in financing activities $ (223) 2,679 12,177
Adjustment      
Increase in net cash used in operating activities     17,600
Variable Interest Entity, Primary Beneficiary [Member] | Adjustment      
Decrease in current liabilities   76,800  
Increase in non-current liabilities   76,800  
Increase in net cash used in operating activities   7,600  
Increase in net cash used in investing activities   5,800 2,900
Increase in net cash used in financing activities   $ 1,800 $ 20,500