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Summary of significant accounting policies - Prior period reclassifications (Details)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2022
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2023
USD ($)
Reclassification            
Provisions   ¥ 90,871   ¥ 30,716   $ 12,799
Other non-current liabilities       0    
Selling, general and administrative expenses   (928,761) $ (130,813) (1,310,207) ¥ (607,868)  
Change in fair value of an equity security   (22,451) (3,162) (16,843) 0  
Gains on sale of an equity security   0 0 59,728 0  
Gains on deconsolidation of a subsidiary ¥ 71,974 0 0 71,974 10,579  
Change in fair value of warrant liabilities   (11,719) (1,651) 3,245 111,299  
Government grants   11,844   59,393 34,507  
Foreign currency exchange gains (losses), net   (10,349)   (18,216) 18,315  
Other non-operating (expenses) income, net   ¥ (9,237) $ (1,301) 152,791 (47,898)  
Before reclassification            
Reclassification            
Provisions       0    
Other non-current liabilities       30,716    
Selling and marketing expenses       (86,597) (82,827)  
General and administrative expenses       (1,223,610) (525,041)  
Selling, general and administrative expenses       0 0  
Change in fair value of an equity security       (16,843) 0  
Gains on sale of an equity security       59,728 0  
Gains on deconsolidation of a subsidiary       71,974 10,579  
Change in fair value of warrant liabilities       3,245 111,299  
Government grants       59,393 34,507  
Foreign currency exchange gains (losses), net       ¥ (18,216) ¥ 18,315