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Business combination - Purchase price at the date of acquisitions (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Allocation of the purchase price at the date of acquisition        
Goodwill $ 23,136 $ 22,607   $ 20,382
Yunwang Wulian        
Allocation of the purchase price at the date of acquisition        
Property and equipment     $ 17  
Accrued liabilities and other payables     (798)  
Shanxian Daojia        
Allocation of the purchase price at the date of acquisition        
Goodwill     $ 781