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PREPAYMENTS AND OTHER CURRENT ASSETS (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
PREPAYMENTS AND OTHER CURRENT ASSETS      
Funds receivable from third party mobile and online payment platforms   ¥ 51,370 ¥ 39,080
Advance to suppliers mainly for cloud computing service   32,120 24,045
VAT receivable   32,031 6,334
Interest receivable   27,168 10,761
Prepaid interest expense   10,082  
Deposits mainly for lease of premises   3,676 9,046
Other receivables   19,145 11,088
Prepayments and other current assets $ 26,911 ¥ 175,592 ¥ 100,354