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Loss per share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted 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 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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