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Income Taxes - Combined effects of income tax expense exemption and other preferential tax treatment (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
¥ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
CNY (¥)
¥ / shares
Dec. 31, 2017
CNY (¥)
¥ / shares
Income Tax Disclosure [Abstract]        
Effect of preferential tax treatment ¥ (40,054) $ (5,753) ¥ (16,128) ¥ 6,836
Basic net income/(loss) per share effect | (per share) ¥ (0.07) $ (0.01) ¥ (0.03) ¥ 0.01