v3.22.2.2
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, 2022
CNY (¥)
¥ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
CNY (¥)
¥ / shares
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net loss attributable to common shareholders ¥ (53,224) $ (7,946) ¥ (69,434)
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 (41,785) (6,238) (54,429)
Net loss attributable to common shareholders ¥ (41,785) $ (6,238) ¥ (54,429)
Weighted average number of shares used in calculating basic and diluted loss per share 62,098,973 62,098,973 61,668,577
Basic loss per share | (per share) ¥ (0.67) $ (0.1) ¥ (0.88)
Dluted loss per share | (per share) ¥ (0.67) $ (0.1) ¥ (0.88)
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 ¥ (11,439) $ (1,708) ¥ (15,005)
Net loss attributable to common shareholders ¥ (11,439) $ (1,708) ¥ (15,005)
Weighted average number of shares used in calculating basic and diluted loss per share 17,000,189 17,000,189 17,000,189
Basic loss per share | (per share) ¥ (0.67) $ (0.1) ¥ (0.88)
Dluted loss per share | (per share) ¥ (0.67) $ (0.1) ¥ (0.88)