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SHORT TERM INVESTMENTS - Interest income (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
SHORT TERM INVESTMENTS |  |  |  |
Interest income recognized on held-to-maturity investments | $ 81 | ¥ 548 | ¥ 1,904 | ¥ 5,836

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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