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LONG-TERM INVESTMENTS - Available-for-sale debt securities (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 50,096	$ 7,263	¥ 62,045
Private equity funds
LONG-TERM INVESTMENTS
Available-for-sale debt securities - Fair Value	¥ 50,096
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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
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-Topic 326
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 320
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-Section 45
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- Definition

States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

+ References

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-Topic 820
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-Paragraph 6A
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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.

+ References

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