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LONG-TERM INVESTMENTS - Available-for-sale debt securities (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 14,625	$ 2,004	¥ 18,924
Private equity funds
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 14,625
Available-for-sale debt securities - Redemption frequency	Annually
Minimum | Private equity funds
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Redemption Notice Period	5 days
Maximum | Private equity funds
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Redemption Notice Period	9 days

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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