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LONG-TERM INVESTMENTS - Available-for-sale debt securities (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 18,924	$ 2,665	¥ 50,096
Private equity funds
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 18,924
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