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Segment reporting (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
segment
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Segment Reporting Information [Line Items]        
Total revenues ¥ 5,561,266 $ 761,891 ¥ 4,699,673 ¥ 3,561,994
Total cost of revenues (4,407,076) (603,767) (3,426,967) (2,568,115)
Gross profit 1,154,190 158,124 1,272,706 993,879
Operating Expenses (2,036,429) (278,989) (2,190,448) (2,622,100)
Loss from operation (882,239) (120,865) (917,742) (1,628,221)
Interest income 22,178 3,038 30,503 13,820
Interest expense (133,761) (18,325) (79,309) (44,543)
(Loss)/gain from equity method investments 40,329 5,525 (43,065) (71,928)
Other non-operating income (expenses), net (34,895) (4,781) (9,525) 152,791
Loss before income taxes (988,388) (135,408) (1,019,138) (1,578,081)
Income tax expenses (1,482) (203) 3,643 (29,065)
Net loss [1] ¥ (989,870) $ (135,611) (1,015,495) (1,607,146)
Number of Reportable Segments | segment 1 1    
Reportable Segment        
Segment Reporting Information [Line Items]        
Total revenues ¥ 5,561,266   4,699,673 3,561,994
Total cost of revenues (4,407,076)   (3,426,967) (2,568,115)
Gross profit 1,154,190   1,272,706 993,879
Operating expenses excluding share-based compensation expense (1,899,479)   (2,016,423) (1,896,449)
Share-based compensation expense (136,950)   (174,025) (725,651)
Operating Expenses (2,036,429)   (2,190,448) (2,622,100)
Loss from operation (882,239)   (917,742) (1,628,221)
Interest income 22,178   30,503 13,820
Interest expense (133,761)   (79,309) (44,543)
(Loss)/gain from equity method investments 40,329   (43,065) (71,928)
Other non-operating income (expenses), net (34,895)   (9,525) 152,791
Loss before income taxes (988,388)   (1,019,138) (1,578,081)
Income tax expenses (1,482)   3,643 (29,065)
Net loss (989,870)   (1,015,495) (1,607,146)
Major customer group        
Segment Reporting Information [Line Items]        
Total revenues ¥ 4,843,519   ¥ 3,805,289 ¥ 2,382,308
Revenue Benchmark | Customer concentration risk | Major customer group        
Segment Reporting Information [Line Items]        
Concentration risk percentage 87.10% 87.10% 81.00% 66.90%
[1] Shares outstanding for all periods reflect the adjustment for Recapitalization.