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Intangible assets, net | 12 Months Ended
--- | ---
Dec. 31, 2019
Intangible assets, net |
Intangible assets, net | 12. Intangible assets, net
|  | December 31, 2018 |  | December 31, 2019
|  |  |  |  |  |  |  | Net book |  |  |  |  |  |  |  | Net book
(In thousands) |  | Cost |  | Amortization |  | Impairment |  | value |  | Cost |  | Amortization |  | Impairment |  | value
Land use rights |  | 4,847 |  | (872) |  | — |  | 3,975 |  | 4,769 |  | (1,017) |  | — |  | 3,752
Acquired computer software |  | 2,099 |  | (1,546) |  | — |  | 553 |  | 2,391 |  | (1,433) |  | — |  | 958
Online game licenses |  | 6,007 |  | (5,278) |  | (729) |  | — |  | 5,910 |  | (5,193) |  | (717) |  | —
Audio-visual licenses |  | 5,714 |  | (251) |  | — |  | 5,463 |  | 5,621 |  | (905) |  | — |  | 4,716
|  | 18,667 |  | (7,947) |  | (729) |  | 9,991 |  | 18,691 |  | (8,548) |  | (717) |  | 9,426
Amortization expense recognized for the years ended December 31, 2017, 2018 and 2019 are summarized as follows:
|  | Years ended December 31
(In thousands) |  | 2017 |  | 2018 |  | 2019
Cost of revenues |  | 241 |  | 266 |  | 5
General and administrative expenses |  | 415 |  | 721 |  | 1,136
Research and development expenses |  | 1,445 |  | 244 |  | 59
Total |  | 2,101 |  | 1,231 |  | 1,200
The estimated aggregate amortization expense for each of the next five years as of December 31, 2019 is:
(In thousands) |  | Intangible assets
2020 |  | 1,186
2021 |  | 1,010
2022 |  | 976
2023 |  | 963
2024 and thereafter |  | 5,291
The weighted average amortization periods of intangible assets as at December 31, 2018 and 2019 are as below:
(In year) |  | December 31, 2018 |  | December 31, 2019
Land use right |  | 30 |  | 30
Acquired computer software |  | 5 |  | 5
Online game licenses |  | 3 |  | 3
Audio-visual license |  | 9 |  | 9
Total weighted average amortization periods |  | 12 |  | 12

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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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