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Property and equipment, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Property and equipment, net |
Schedule of Property and Equipment | ​
​ | ​ | ​ | ​ | ​
(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
Summary of Depreciation Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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