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Goodwill (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Goodwill (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)
Goodwill.
Addition	¥ 66,506
Balance as of December 31	66,506	$ 9,367
Impairment charges	¥ 0		¥ 0	¥ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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