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Fair value measurements (Summary of Liabilities Measured at Fair Value on Recurring Basis) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Investments:      
Short-term investments ¥ 124,550 $ 19,143 ¥ 0
Available-for-sale securities [1] 140,212   188,597
Recurring [Member]      
Investments:      
Short-term investments 124,550    
Available-for-sale securities 140,212   188,597
Total 264,762    
Recurring [Member] | Level 1 [Member]      
Investments:      
Short-term investments 29,570    
Available-for-sale securities 138,251   182,480
Total 167,821    
Recurring [Member] | Level 2 [Member]      
Investments:      
Short-term investments 94,980    
Available-for-sale securities 0   0
Total 94,980    
Recurring [Member] | Level 3 [Member]      
Investments:      
Short-term investments 0    
Available-for-sale securities 1,961   ¥ 6,117
Total ¥ 1,961    
[1] In 2016, one of the Group's investees became listed on NASDAQ Global Market. As the investment has readily determinable fair value upon listing, the Group reclassified this investment as an available-for-sale security upon its listing and recorded the investment at fair value with unrealized holding gain or loss recognized in other comprehensive income under ASC 320.