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SHORT-TERM INVESTMENTS - Interest income (Details) - CNY (¥) ¥ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
SHORT-TERM INVESTMENTS |  |
Interest income recognized on held-to-maturity investments | ¥ 672 | ¥ 175

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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration