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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)

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Net loss attributable to class A and class B common shareholders.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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