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ACCOUNTS RECEIVABLE, NET (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
ACCOUNTS RECEIVABLE, NET      
Accounts receivable   ¥ 27,219 ¥ 20,932
Less: Allowance for doubtful accounts   (6,247) (2,993)
Accounts receivable, net $ 3,214 ¥ 20,972 ¥ 17,939