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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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