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Intangible assets, net | 12 Months Ended
--- | ---
Dec. 31, 2020
Intangible assets, net |
Intangible assets, net | 13. Intangible assets, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net book | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net book
(In thousands) |  | Cost |  | Amortization |  | Impairment |  | value |  | Cost |  | Amortization |  | Impairment |  | value
Land use rights |  | 4,769 |  | (1,017) |  | — |  | 3,752 |  | 5,099 |  | (1,258) |  | — |  | 3,841
Acquired computer software |  | 2,391 |  | (1,433) |  | — |  | 958 |  | 3,530 |  | (2,853) |  | — |  | 677
Online game licenses |  | 5,910 |  | (5,193) |  | (717) |  | — |  | — |  | — |  | — |  | —
Audio-visual license |  | 5,621 |  | (905) |  | — |  | 4,716 |  | 6,010 |  | (1,671) |  | — |  | 4,339
​ |  | 18,691 |  | (8,548) |  | (717) |  | 9,426 |  | 14,639 |  | (5,782) |  | — |  | 8,857
​ Amortization expense recognized for the years ended December 31, 2018, 2019 and 2020 are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31
(In thousands) |  | 2018 |  | 2019 |  | 2020
Cost of revenues |  | 266 |  | 5 |  | —
General and administrative expenses |  | 721 |  | 1,136 |  | 1,210
Research and development expenses |  | 244 |  | 59 |  | 6
Total |  | 1,231 |  | 1,200 |  | 1,216
​ The estimated aggregate amortization expense for each of the next five years as of December 31, 2020 is: ​
​ | ​ | ​
(In thousands) |  | Intangible assets
2021 |  | 1,107
2022 |  | 1,050
2023 |  | 1,036
2024 |  | 972
2025 and thereafter |  | 4,692
​ The weighted average amortization periods of intangible assets as at December 31, 2019 and 2020 are as below: ​
​ | ​ | ​ | ​ | ​
(In year) |  | December 31, 2019 |  | December 31, 2020
Land use rights |  | 30 |  | 30
Acquired computer software |  | 5 |  | 5
Online game licenses |  | 3 |  | —
Audio-visual license |  | 9 |  | 9
Total weighted average amortization periods |  | 12 |  | 10
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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