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INVENTORIES (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Disclosure Of INVENTORIES [Line Items]    
Raw materials ¥ 4,919 ¥ 6,281
Work in progress 1,040 1,040
Finished goods 128,155 151,630
Inventories 27,364 52,201
Inventory gross    
Disclosure Of INVENTORIES [Line Items]    
Inventories 134,114 158,951
Impairment provision    
Disclosure Of INVENTORIES [Line Items]    
Inventories ¥ (106,750) ¥ (106,750)