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INVENTORIES - Amount of inventories recognized as an expense and included in profit or loss (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
INVENTORIES      
Carrying amount of inventories sold ¥ 248,166 ¥ 211,292 ¥ 303,021
Write down of inventories ( reversal of inventory provision) (99,237) (2,301) (56,766)
Write down (reversal) of inventories (included in cost of sales) (99,237) (2,301) (56,766)
Cost of sales ¥ 148,929 ¥ 208,991 ¥ 246,255