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RELATED PARTY TRANSACTIONS - Balances (Details) ¥ in Thousands, $ in Thousands | Jun. 30, 2021 USD ($) | Jun. 30, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
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RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties | $ 501 | ¥ 3,235 | ¥ 3,024
Amounts due to related parties | $ 429 | 2,771 | 2,543
Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 3,235 | 3,024
Amounts due to related parties |  | 2,771 | 2,543
Shandong Shichuang Software Engineering Company Limited | Senior employee |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due to related parties |  | 2,417 | 2,417
Jinan QCY Intelligent Technology Co., Ltd | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 775 | 774
Beijing QC Technology Company Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 2,039 | 1,961
Amounts due to related parties |  | 354 | 126
URSUS Information Technology (Beijing) Company Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | 201 | 201
Beijing HJRT Technology Company, Limited | Management |  |  |
RELATED PARTY TRANSACTIONS [Line Items] |  |  |
Amounts due from related parties |  | ¥ 220 | ¥ 88

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