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Other long-term assets (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Other long-term assets      
Deposit for land use rights   ¥ 105,840  
Prepayment for investments (Note a)     ¥ 240,000
Long term trade receivables (Note b)   221,000 63,872
Loan to staff   67,810 62,888
Long term loan receivables   5,586  
Subtotal   400,236 366,760
Less: allowance for doubtful accounts   (3,789)  
Total $ 57,661 ¥ 396,447 ¥ 366,760
Maximum      
Other long-term assets      
Number of instalment payment 24 months