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Intangible assets, net - Additional Information (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Intangible assets, net      
Amortization expenses   ¥ 2,158 ¥ 2,158
Yuancui      
Intangible assets, net      
Intangible assets acquired in connection with business combination ¥ 7,810    
Amortization expenses ¥ (392) ¥ 0 ¥ (1,766)