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Loss per share - Basic and Diluted Loss Per Share (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
CNY (¥)
¥ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
CNY (¥)
¥ / shares
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net loss attributable to common shareholders ¥ (69,434) $ (10,754) ¥ (91,446)
Class A [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net loss attributable to Class A and Class B common shareholders (54,429) (8,430) (71,306)
Net loss attributable to common shareholders ¥ (54,429) $ (8,430) ¥ (71,306)
Weighted average number of shares used in calculating basic and diluted loss per share 61,668,577 61,668,577 60,190,846
Basic and diluted loss per share | (per share) ¥ (0.88) $ (0.14) ¥ (1.18)
Class B [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net loss attributable to Class A and Class B common shareholders ¥ (15,005) $ (2,324) ¥ (20,140)
Net loss attributable to common shareholders ¥ (15,005) $ (2,324) ¥ (20,140)
Weighted average number of shares used in calculating basic and diluted loss per share 17,000,189 17,000,189 17,000,189
Basic and diluted loss per share | (per share) ¥ (0.88) $ (0.14) ¥ (1.18)