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RELATED PARTY TRANSACTIONS (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Shandong Shichuang Software Engineering Company Limited |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Balance netting off with related party | ¥ 572 | ¥ (572) | ¥ (1,013)
Jinan QCY Intelligent Technology Co., Ltd |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Service purchased from related party | (3,401) |  |
Member of Management Team of Beijing QC Technology Company Limited |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Service provided to related party |  | 950 | 950
Beijing QC Technology Company Limited |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Service purchased from related party | (785) |  | (461)
URSUS Information Technology (Beijing) Company Limited |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Service purchased from related party |  | ¥ (873) | ¥ (428)
Beijing HJRT Technology Company, Limited |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Service purchased from related party | ¥ (264) |  |

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