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Income Taxes - Movement of valuation allowance of deferred tax assets (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]        
Balance as of January 1, ¥ 55,997 $ 8,043 ¥ 14,208 ¥ 11,402
Additions 70,709 10,158 37,584 6,164
Increase from an acquired subsidiary 997 143 8,576  
Reversals (799) (115) (4,371) (3,358)
Balance as of December 31, ¥ 126,904 $ 18,229 ¥ 55,997 ¥ 14,208