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Property and equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross $ 55,647 $ 48,072
Less: Accumulated depreciation (35,459) (27,650)
Less: Impairment (20) 0
Sub-total 20,168 20,422
Construction in progress 4,517 574
Total 24,685 20,996
Servers and network equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 49,582 42,597
Computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 1,785 1,538
Furniture, fittings and office equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 850 845
Motor vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross 273 299
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property plant and equipment, gross $ 3,157 $ 2,793