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Intangible assets, net
 6 Months Ended
Jun. 30, 2024
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets, net Intangible assets, net
Intangible assets, net consisted of the following:

As of December 31,As of June 30,
20232024
RMBRMB
Software121,950 143,461 
Software license rights143,725 143,725 
Trademark 139 139 
Patents2,655 141,224 
Intangible assets268,469 428,549 
Less: accumulated amortization(86,183)(130,945)
Less: impairment (2,945)(3,570)
Intangible assets, net179,341 294,034 

The Group acquired patents of RMB138,569 in the asset acquisition (refer to Note 1(c)). The acquired patents are amortized over a period of ten years.

Amortization of intangible assets was allocated as follows:
Six Months Ended June 30,
20232024
RMBRMB
Cost of revenues— 23,954 
Selling, general and administrative expenses4,902 4,605 
Research and development expenses7,105 16,184 
Total amortization12,007 44,743 

In the six months ended June 30, 2024, an impairment loss of RMB625 was recognized for obsolete software, which was included in selling, general and administrative expenses. No impairment loss was recorded in the six months ended June 30, 2023.