Summary of Significant Accounting Policies - Trade receivable and current expected credit losses (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	¥ 1,264	$ 173	¥ (1,079)	¥ 2,910
Trade receivables
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	¥ 0		¥ 0	¥ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details