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INTANGIBLE ASSETS, NET- Impairment and Amortization (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INTANGIBLE ASSETS, NET [Line Items]      
Impairment loss   ¥ 5,030  
Amortization expenses ¥ 5,599 6,042 ¥ 4,651
Amortization expenses included in cost of sales 3,696 ¥ 3,063 1,393
Trade name [Member]      
INTANGIBLE ASSETS, NET [Line Items]      
Impairment loss     ¥ 0
Other      
INTANGIBLE ASSETS, NET [Line Items]      
Impairment loss ¥ 1,386