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Segment - Reportable segments (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Segment Reporting Information [Line Items]        
Total profit ¥ 661,378 $ 93,153 ¥ 471,987 ¥ 381,796
Sales and marketing expenses (148,798) (20,958) (104,835) (69,266)
General and administrative expenses (320,144) (45,091) (201,007) (236,713)
Research and development expenses (790,547) (111,346) (555,179) (368,435)
Other operating income, net 26,520 3,735 10,817 27,333
Interest income 99,813 14,058 58,734 32,584
Interest expenses (3,069) (432)    
Foreign exchange (loss) gain (452) (64) 20,858 (13,275)
Other (loss) income, net 34 5 (2,161) 118
Net loss before income tax and share of loss in equity method investments (475,265) $ (66,940) (300,786) (245,858)
Reportable segments        
Segment Reporting Information [Line Items]        
Total profit 661,378   471,987 381,796
Sales and marketing expenses (148,798)   (104,835) (69,266)
General and administrative expenses (320,144)   (201,007) (236,713)
Research and development expenses (790,547)   (555,179) (368,435)
Other operating income, net 26,520   10,817 27,333
Interest income 99,813   58,734 32,584
Interest expenses (3,069)      
Foreign exchange (loss) gain (452)   20,858 (13,275)
Other (loss) income, net 34   (2,161) 118
Net loss before income tax and share of loss in equity method investments ¥ (475,265)   ¥ (300,786) ¥ (245,858)