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Short-term Investments (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Short-term Investments        
Interest income on short-term investments $ 16,833 ¥ 115,737 ¥ 12,483 ¥ 1,522