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ACCRUED LIABILITIES AND OTHER PAYABLES - Accrued liabilities and other payables are denominated in currencies (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Current accrued expenses and other current liabilities ¥ 22,381 ¥ 22,846
Renminbi    
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Current accrued expenses and other current liabilities 22,381 ¥ 22,846
US dollars    
Disclosure Of ACCRUED LIABILITIES AND OTHER PAYABLES [Line Items]    
Current accrued expenses and other current liabilities ¥ 0