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Convertible notes payable (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2024
CNY (¥)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Debt Instrument [Line Items]      
Convertible notes payable ¥ 467,617 $ 64,346 ¥ 455,701
Convertible notes      
Debt Instrument [Line Items]      
Interest rate (in percent) 5.00% 5.00% 5.00%
Aggregate principal amount ¥ 472,368   ¥ 461,494
Unamortized debt issuance costs (4,751)   (5,793)
Convertible notes payable 467,617   455,701
Estimate of Fair Value Measurement | Level 3 | Convertible notes      
Debt Instrument [Line Items]      
Fair value ¥ 415,702   ¥ 396,884