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Short-term borrowings (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Short-term borrowings      
Short-term borrowings $ 21,419 ¥ 147,264 ¥ 200,000
Short-term borrowings      
Short-term borrowings      
Weighted average interest rate 4.15% 4.15% 7.00%