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RELATED PARTY TRANSACTIONS - Balances (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
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RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties | $ 463 | ¥ 3,024 | ¥ 2,318
Amounts due to related parties | $ 390 | 2,543 | 1,971
Shandong Shichuang Software Engineering Company Limited | Senior employee |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due to related parties |  | 2,417 | 1,845
Jinan QCY Intelligent Technology Co., Ltd | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 774 |
Beijing QC Technology Company Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 1,961 | 2,028
Amounts due to related parties |  | 126 | 126
URSUS Information Technology (Beijing) Company Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 201 | 202
Beijing HJRT Technology Company, Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | ¥ 88 | ¥ 88

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