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Intangible assets | 12 Months Ended
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Dec. 31, 2020
Intangible assets |
Intangible assets | 7. Intangible assets The following table presents the Group's intangible assets with definite lives as of the respective balance sheet dates:
|  | December 31, 2019 |  | December 31, 2020
|  | RMB |  | RMB
Customer relationships |  | — |  | 3,300
Trade names |  | — |  | 4,822
Technologies |  | — |  | 17,833
Total Intangible assets |  | — |  | 25,955
Less: accumulated amortization - Customer relationships |  | — |  | (1,100)
accumulated amortization – Trade names |  | — |  | (487)
accumulated amortization - Technologies |  | — |  | (2,547)
Intangible assets, net |  | — |  | 21,821
The Company acquired Longye on January 13, 2020 and identified the intangible assets of customer relationships, trade names and technologies (Note 24). The intangible assets are amortized using straight-line method, which is the Group's best estimate of how these assets will be economically consumed over their respective estimated useful lives ranging from approximately 3 to 10 years. Amortization expense was nil, nil and RMB4.1 million for the years ended December 31, 2018, 2019 and 2020, respectively. Based on the current amount of intangible assets subject to amortization, the estimated amortization expenses for each of the following five years are as follows: 2021: RMB4.1 million, 2022: RMB4.1 million, 2023: RMB3.0 million, 2024: RMB3.0 million and 2025: RMB3.0 million.

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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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