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INVENTORIES, NET - Schedule of inventories net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2021
USD ($)
Merchandise and packing materials ¥ 91,496 ¥ 145,773  
Less: inventory write-downs (6,996) (10,528)  
Total inventories, net ¥ 84,500 ¥ 135,245 $ 13,260