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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
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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 |

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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 + Details
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