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Property and equipment | 12 Months Ended
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Dec. 31, 2017
Property and equipment [Abstract] |
Property and equipment |
8. | Property and equipment
Property and equipment consist of the following:
(In thousands) |  | December 31, 2016 |  | December 31, 2017 |
Servers and network equipment |  |  | 42,597 |  |  | 49,582 |
Computer equipment |  |  | 1,538 |  |  | 1,785 |
Furniture, fixtures and office equipment |  |  | 845 |  |  | 850 |
Motor vehicles |  |  | 299 |  |  | 273 |
Leasehold improvements |  |  | 2,793 |  |  | 3,157 |
Total original costs |  |  | 48,072 |  |  | 55,647 |
Less: Accumulated depreciation |  |  | (27,650) |  |  | (35,459) |
Less: Impairment |  |  | — |  |  | (20) |
Sub-total |  |  | 20,422 |  |  | 20,168 |
Construction in progress |  |  | 574 |  |  | 4,517 |
Total |  |  | 20,996 |  |  | 24,685 |
Depreciation expense recognized for the years ended December 31, 2015, 2016 and 2017 are summarized as follows:
(In thousands) |  | December 31, 2015 |  | December 31, 2016 |  | December 31, 2017 |
Cost of revenues |  |  | 4,873 |  |  | 5,848 |  |  | 7,647 |
General and administrative expenses |  |  | 628 |  |  | 306 |  |  | 277 |
Sales and marketing expenses |  |  | 7 |  |  | 5 |  |  | — |
Research and development expenses |  |  | 8 |  |  | 6 |  |  | 24 |
Total |  |  | 5,516 |  |  | 6,165 |  |  | 7,948 |
Impairment loss of USD 20,000 has been recognized for the year ended December 31, 2017. No impairment loss was recognized for the years end December 31, 2015 and 2016.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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