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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, 2019
Dec. 31, 2018
Dec. 31, 2017
INVENTORIES      
Carrying amount of inventories sold ¥ 303,021 ¥ 443,382 ¥ 774,171
Write down of inventories (reversal of inventory provision) (56,766) 55,973 (2,733)
Cost of sales ¥ 246,255 ¥ 499,355 ¥ 771,438