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Loss per share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Loss per share | 10 Loss per share Basic and diluted loss per share is calculated as follows:
|  | For the six months ended June 30, |
|  | 2020 |  |  | 2021 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |  |  | RMB |  |  | US$ |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to Class A and Class B common shareholders |  |  | (71,306 | ) |  |  | (20,140 | ) |  |  | (54,429 | ) |  |  | (8,430 | ) |  |  | (15,005 | ) |  |  | (2,324 | )
Net loss attributable to common shareholders |  |  | (71,306 | ) |  |  | (20,140 | ) |  |  | (54,429 | ) |  |  | (8,430 | ) |  |  | (15,005 | ) |  |  | (2,324 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares used in calculating basic and diluted loss per share |  |  | 60,190,846 |  |  |  | 17,000,189 |  |  |  | 61,668,577 |  |  |  | 61,668,577 |  |  |  | 17,000,189 |  |  |  | 17,000,189 |
Basic and diluted loss per share |  |  | (1.18 | ) |  |  | (1.18 | ) |  |  | (0.88 | ) |  |  | (0.14 | ) |  |  | (0.88 | ) |  |  | (0.14 | )
For the six months ended June 30, 2020 and 2021, the two-class method is applicable because the Company has Class A and Class B ordinary shares outstanding, and both classes have contractual rights with regards to dividends and distributions upon liquidation of the Company. As the Company is in a net loss position, the effect of share options, restricted share units and convertible notes were excluded from the computation of diluted loss per share for the six months ended June 30, 2020 and 2021 as they would be anti-dilutive.​​​​​​​

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