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Inventories
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories

4.

INVENTORIES

As of December 31, 

2022

2023

    

RMB

    

RMB

Raw materials

 

290,121

 

126,347

Work-in-process

 

180,367

 

199,153

Finished goods

 

176,364

 

170,377

Inventories

 

646,852

 

495,877

Inventory write-off were RMB16,600, RMB39,431 and RMB9,290, respectively, for the years ended December 31, 2021, 2022 and 2023.