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Non-controlling interests (Tables)
12 Months Ended
Dec. 31, 2023
Noncontrolling Interest [Abstract]  
Schedule of balance of redeemable non-controlling interests
RMB
Balance as of January 1, 202230,500 
Add: Capital contribution10,000 
Less: Comprehensive loss(464)
Add: Accretion of redeemable non-controlling interests714 
Less: Deconsolidation of Suzhou Photon-Matrix(40,750)
Balance as of December 31, 2022 and 2023