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Property and equipment | 12 Months Ended
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Dec. 31, 2019
Property and equipment |
Property and equipment | 10. Property and equipment Property and equipment consist of the following:
(In thousands) |  | December 31, 2018 |  | December 31, 2019
Servers and network equipment |  | 39,870 |  | 39,130
Computer equipment |  | 1,889 |  | 1,762
Furniture, fixtures and office equipment |  | 838 |  | 806
Motor vehicles |  | 476 |  | 406
Leasehold improvements |  | 3,190 |  | 6,566
Total original costs |  | 46,263 |  | 48,670
Less: Accumulated depreciation |  | (31,125) |  | (28,357)
Less: Accumulated impairment |  | (10) |  | (4)
Sub-total |  | 15,128 |  | 20,309
Construction in progress |  | 6,775 |  | 18,461
Total |  | 21,903 |  | 38,770
Depreciation expense recognized for the years ended December 31, 2017, 2018 and 2019 are summarized as follows:
(In thousands) |  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2019
Cost of revenues |  | 7,647 |  | 5,018 |  | 5,198
General and administrative expenses |  | 277 |  | 245 |  | 317
Sales and marketing expenses |  | — |  | 1 |  | 9
Research and development expenses |  | 24 |  | 331 |  | 300
Total |  | 7,948 |  | 5,595 |  | 5,824
Impairment loss of USD 20,000 has been recognized for the year ended December 31, 2017. No impairment loss was recognized for the years ended December 31, 2018. Impairment loss of USD 6,000 has been reversed for the year ended December 31, 2019 due to disposal.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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