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Property and equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property and equipment |
Schedule of Property and Equipment | ​
​ | ​ | ​ | ​ | ​
(In thousands) |  | December 31, 2019 |  | December 31, 2020
Servers and network equipment |  | 39,130 |  | 35,827
Computer equipment |  | 1,762 |  | 1,565
Furniture, fixtures and office equipment |  | 806 |  | 836
Motor vehicles |  | 406 |  | 481
Leasehold improvements |  | 6,566 |  | 6,604
Total original costs |  | 48,670 |  | 45,313
Less: Accumulated depreciation |  | (28,357) |  | (33,006)
Less: Accumulated impairment |  | (4) |  | (3)
Sub-total |  | 20,309 |  | 12,304
Construction in progress |  | 18,461 |  | 38,421
Total |  | 38,770 |  | 50,725
Summary of Depreciation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Years ended December 31
(In thousands) | ​ | 2018 | ​ | 2019 | ​ | 2020
Cost of revenues |  | 5,018 |  | 5,198 |  | 6,247
Research and development expenses |  | 331 |  | 300 |  | 529
General and administrative expenses |  | 245 |  | 317 |  | 2,492
Sales and marketing expenses |  | 1 |  | 9 |  | 9
Total |  | 5,595 |  | 5,824 |  | 9,277

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Depreciation Expense Table [Text Block] + References No definition available. + Details
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