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Intangible assets, net | 12 Months Ended
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Dec. 31, 2022
Intangible assets, net |
Intangible assets, net | 10. Intangible assets, net Intangible assets, net consisted of the following: ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB
Software | ​ | 69,732 | ​ | 93,861
Less: accumulated amortization | ​ | (38,706) | ​ | (57,172)
Intangible assets, net | ​ | 31,026 |  | 36,689
​ Amortization of intangible assets was allocated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB | ​ | RMB
Cost of revenues | ​ | 96 | ​ | 77 | ​ | —
Selling and marketing expenses |  | 1,027 | ​ | 876 |  | 257
General and administrative expenses |  | 2,535 | ​ | 5,845 |  | 9,590
Research and development expenses |  | 16,820 | ​ | 15,077 |  | 12,721
Total amortization |  | 20,478 | ​ | 21,875 |  | 22,568
​ The estimated amortization for existing intangible assets in each of the next five years is RMB20,202, RMB11,356, RMB5,131, nil and nil, respectively. ​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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