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Income Taxes - Reconciliation of liabilities associated with uncertain tax positions (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, ¥ 26,131 $ 3,753 ¥ 24,714 ¥ 21,723
Increase related to current year tax positions 1,481 213 1,417 2,991
Balance as of December 31, ¥ 27,612 $ 3,966 ¥ 26,131 ¥ 24,714