Share-based compensation - Share Based Compensation Related to Parent's Series D Financing (Details) ¥ in Thousands, $ in Thousands		12 Months Ended
	Nov. 25, 2020 shares	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	[1]	Dec. 31, 2021 CNY (¥)	[1]
Share-based compensation
Number of shares issued	143,681,555
Share-based compensation expenses		¥ 362,868	$ 51,108	¥ 166,161		¥ 223,345

[1] The Company acquired various companies on December 13, 2023, which was accounted for as an under common control transaction in accordance with ASC 805-50. The Company retrospectively adjusted the above comparative consolidated balance sheets in prior year. Refer