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Intangible assets, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Intangible assets, net |
Schedule of Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | Net book | ​ | ​ | ​ | ​ | ​ | Net book
(In thousands) |  | Cost |  | Amortization |  | value |  | Cost |  | Amortization |  | value
Land use rights |  | 5,099 |  | (1,258) |  | 3,841 |  | 5,218 |  | (1,461) |  | 3,757
Acquired computer software |  | 3,530 |  | (2,853) |  | 677 |  | 3,875 |  | (3,053) |  | 822
Audio-visual license |  | 6,010 |  | (1,671) |  | 4,339 |  | 6,151 |  | (2,431) |  | 3,720
​ |  | 14,639 |  | (5,782) |  | 8,857 |  | 15,244 |  | (6,945) |  | 8,299
Schedule of Amortization Expense Recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31
(In thousands) |  | 2019 |  | 2020 |  | 2021
Cost of revenues |  | 5 |  | — |  | 10
General and administrative expenses |  | 1,136 |  | 1,210 |  | 1,113
Research and development expenses |  | 59 |  | 6 |  | 6
Total |  | 1,200 |  | 1,216 |  | 1,129
Schedule of Estimated Aggregate Amortization Expense | ​
​ | ​ | ​
(In thousands) |  | Intangible assets
2022 |  | 1,153
2023 |  | 1,140
2024 |  | 1,071
2025 |  | 974
2026 and thereafter |  | 3,961
Schedule of Weighted Average Amortization Periods of Intangible Assets | ​
​ | ​ | ​ | ​ | ​
(In year) |  | December 31, 2020 |  | December 31, 2021
Land use rights |  | 30 |  | 30
Acquired computer software |  | 5 |  | 5
Audio-visual license |  | 9 |  | 9
Total weighted average amortization periods |  | 10 |  | 10

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