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RELATED PARTY TRANSACTIONS (Details) - CNY (¥) ¥ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Jinan QCY Intelligent Technology Co., Ltd |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |
Service purchased from related party | ¥ (1,279) | ¥ (1,417)
Beijing QC Technology Company Limited |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |
Service purchased from related party | (654) | (152)
Beijing HJRT Technology Company, Limited |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |
Service purchased from related party | ¥ (132) | ¥ (132)

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