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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short term lease payments ¥ 154    
Material liabilities 0 ¥ 0 ¥ 0
Capital commitments outstanding ¥ 80,732