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Long-term investments (Tables)
 12 Months Ended
Dec. 31, 2024
Long-Term Investments [Abstract]  
Schedule of long-term investments
As of December 31,
20232024
RMBRMB
Equity method investments 252,407 10,523 
Equity securities 48,580 5,316 
Total long-term investments300,987 15,839 
Schedule of combined financial information for investee companies
 Year ended December 31,
 2022
RMB
Fair value of the consideration received— 
Add: Fair value of retained equity interest in Suzhou Photon-Matrix64,000 
Add: Carrying amount of redeemable noncontrolling interest40,750 
Less: Carrying amount of non-redeemable noncontrolling interest(7,178)
Less: Carrying amount of Suzhou Photon-Matrix’s net assets(25,598)
Gains on deconsolidation of Suzhou Photon-Matrix71,974 
Summary of combined financial position for the investee companies as of December 31, 2023 and 2024 and the results of operation for the years ended December 31, 2022, 2023 and 2024 is as follows:
As of December 31,
20232024
RMBRMB
Financial position:
Current assets 878,519 1,043,993 
Non-current assets 1,093,602 362,528 
Total assets 1,972,121 1,406,521 
Current liabilities 1,043,703 1,376,495 
Non-current liabilities 1,146,673 1,170,600 
Total liabilities 2,190,376 2,547,095 
Shareholders’ deficit(218,255)(1,140,574)
Total liabilities and shareholders’ deficit1,972,121 1,406,521 
Year ended December 31,
202220232024
RMBRMBRMB
Results of operations:
Total revenues1,134,152 1,290,126 1,639,035 
Loss from operation(636,240)(795,354)(967,402)
Net loss(641,401)(839,052)(1,014,495)