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Property and equipment, net - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total original costs $ 26,036 $ 45,313
Less: Accumulated depreciation (18,638) (33,006)
Less: Accumulated impairment (2) (3)
Sub-total 7,396 12,304
Construction in progress 50,261 38,421
Total 57,657 50,725
Servers and network equipment    
Property, Plant and Equipment [Line Items]    
Total original costs 15,522 35,827
Computer equipment    
Property, Plant and Equipment [Line Items]    
Total original costs 1,737 1,565
Furniture, fixtures and office equipment    
Property, Plant and Equipment [Line Items]    
Total original costs 857 836
Motor vehicles    
Property, Plant and Equipment [Line Items]    
Total original costs 492 481
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total original costs $ 7,428 $ 6,604