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PREPAYMENTS AND OTHER CURRENT ASSETS (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
PREPAYMENTS AND OTHER CURRENT ASSETS          
Rental and other deposits   ¥ 677     ¥ 3,116
Prepayments for rental and others   19,725     29,799
Employee advances   4,082     9,268
Payments made on behalf of customers   462,841     458,199
Prepaid insurance premium   958     1,035
Interest income receivable   37,344     51,374
Others   1,931     6,314
Total   527,558   $ 85,933 ¥ 559,105
Payments made on behalf of customers          
Roll forward of the valuation allowance          
Balance at beginning of period ¥ 459 856 ¥ 958    
Additions 9,656 843 1,723    
Write-offs (7,068) (1,240) (1,825)    
Balance at end of period ¥ 3,047 ¥ 459 ¥ 856