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SIGNIFICANT RELATED PARTY TRANSACTIONS - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2014 USD ($) | Oct. 31, 2014 CNY (¥) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in service agreement charges | $ 1,000 | ¥ 6,000 | $ 4,900 | ¥ 30,000,000 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  | ¥ 36,348,000 |  | ¥ 36,217,000
Stuart Management Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of administrative services |  |  |  |  |  |  | $ 6,000 | ¥ 40,000 | $ 12,000 | ¥ 81,000 |  |  |  |
Wong Kung Tok [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings, classified as financing activities |  |  |  |  | ¥ 35,057,000 | ¥ 35,057,000 |  |  |  |  |  |  |  |
Sound Treasure Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | $ 167,000 | 1,160,000 | $ 167,000 | 1,160,000
Alex Ng [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | ¥ 131,000,000 |  | ¥ 0

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