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Income Taxes - current and deferred portions of income tax expense (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Income taxes        
Current income tax expense $ 0 ¥ 0 ¥ 0 ¥ 0
Deferred tax expense $ 0 ¥ 0 ¥ 0 ¥ 0