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Property and equipment, net | 12 Months Ended
--- | ---
Dec. 31, 2021
Property and equipment, net |
Property and equipment, net | 10. Property and equipment, net Property and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​
(In thousands) |  | December 31, 2020 |  | December 31, 2021
Servers and network equipment |  | 35,827 |  | 15,522
Computer equipment |  | 1,565 |  | 1,737
Furniture, fixtures and office equipment |  | 836 |  | 857
Motor vehicles |  | 481 |  | 492
Leasehold improvements |  | 6,604 |  | 7,428
Total original costs |  | 45,313 |  | 26,036
Less: Accumulated depreciation |  | (33,006) |  | (18,638)
Less: Accumulated impairment |  | (3) |  | (2)
Sub-total |  | 12,304 |  | 7,396
Construction in progress |  | 38,421 |  | 50,261
Total |  | 50,725 |  | 57,657
​ 10. Property and equipment, net (Continued) No impairment loss was recognized for the years ended December 31, 2019, 2020 and 2021. Depreciation expense recognized for the years ended December 31, 2019, 2020 and 2021 are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
(In thousands) |  | 2019 |  | 2020 |  | 2021
Cost of revenues |  | 5,198 |  | 6,247 |  | 4,805
Research and development expenses |  | 300 |  | 529 |  | 436
General and administrative expenses |  | 317 |  | 2,492 |  | 1,068
Sales and marketing expenses |  | 9 |  | 9 |  | 10
Total |  | 5,824 |  | 9,277 |  | 6,319
​

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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