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Intangible assets, net

12 Months Ended

Dec. 31, 2021

12. Intangible assets, net

Amortization 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	—	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

The estimated aggregate amortization expense for each of the next five years as of December 31, 2021 is:

12. Intangible assets, net (Continued)

The weighted average amortization periods of intangible assets as of December 31, 2020 and 2021 are as below:


(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