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SHORT-TERM INVESTMENTS - Interest income (Details) - CNY (¥) ¥ in Thousands	6 Months Ended
	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

Name:	us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_ShortTermInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration