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ACCOUNTS RECEIVABLE, NET (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2021
USD ($)
Jun. 30, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
ACCOUNTS RECEIVABLE, NET      
Accounts receivable   ¥ 28,447 ¥ 27,219
Less: Allowance for doubtful accounts   (7,213) (6,247)
Accounts receivable, net $ 3,289 ¥ 21,234 ¥ 20,972