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Taxation - Components of income tax expense (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Taxation        
Current income tax expense   ¥ 2,588 ¥ 6,540 ¥ 3,277
Deferred income tax (benefit) $ 169 1,178 (2,107) (911)
Income tax expense $ 541 ¥ 3,766 ¥ 4,433 ¥ 2,366