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Income Taxes - Movement of valuation allowance (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Income Tax Disclosure [Abstract]        
Additions in valuation allowance ¥ 70,709 $ 10,158 ¥ 37,584 ¥ 6,164