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FAIR VALUE MEASUREMENTS - Fair value measurement of the Group's assets and liabilities that are measured at fair value on a recurring basis (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Equity securities with readily determinable fair value	¥ 153,326	¥ 94,552
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	729,674	228,698
Fair Value, Measurements, Recurring [Member] | Long-term investments [member]
Assets, Fair Value Disclosure [Abstract]
Equity securities with readily determinable fair value	153,326	94,552
Equity securities accounted for under alternative measurement	196,296
Fair Value, Measurements, Recurring [Member] | Wealth Management Products [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	212,271
Fair Value, Measurements, Recurring [Member] | Bank Time Deposits [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	167,781	134,146
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	153,326	94,552
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term investments [member]
Assets, Fair Value Disclosure [Abstract]
Equity securities with readily determinable fair value	153,326	94,552
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	576,348	134,146
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member] | Short-term Investments [Member]
Assets, Fair Value Disclosure [Abstract]
Assets, Fair Value Disclosure	167,781	¥ 134,146
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term investments [member]
Assets, Fair Value Disclosure [Abstract]
Equity securities accounted for under alternative measurement	¥ 196,296

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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