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PREPAYMENTS AND OTHER CURRENT ASSETS (Tables)
12 Months Ended
Dec. 31, 2019
PREPAYMENTS AND OTHER CURRENT ASSETS  
Schedule of components of prepayments and other current assets

​

​

​

​

​

​

​

    

2018

    

2019

​

​

RMB

​

RMB

Rental and other deposits

​

2,766

​

4,691

Prepayments for rental and others

​

23,689

​

16,208

Employee advances

​

27,136

​

23,295

Payments made on behalf of customers, net of allowance

​

472,502

​

475,901

Prepaid insurance premium

​

1,158

​

1,493

Interest income receivable

​

74,231

​

88,990

Receivables related to net proceeds from share options exercised

​

—

​

50,765

Others

​

5,436

​

7,865

Total

​

606,918

​

669,208

Schedule of movement of allowance for payments made on behalf of customers

​

​

​

​

​

​

​

​

​

    

2017

    

2018

    

2019

​

​

RMB

​

RMB

​

RMB

Balance at beginning of year

​

459

​

3,047

​

1,391

Additions

​

9,656

​

—

​

5,104

Reversals

​

—

​

(1,094)

​

—

Write-offs

​

(7,068)

​

(562)

​

(950)

Balance at end of year

​

3,047

​

1,391

​

5,545