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Net Loss per Share - Summary of Basic and Diluted Net Loss per Share (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020 CNY (¥) ¥ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 CNY (¥) ¥ / shares shares
Numerator:
Net loss attributable to ordinary shareholders	¥ (570,635)	$ (84,045)	¥ (1,103,380)
Denominator:
Weighted average number of ordinary shares outstanding—basic and diluted	126,758,926	126,758,926	7,184,086
Net loss per share—basic and diluted | (per share)	¥ (4.50)	$ (0.66)	¥ (153.59)

X

- Definition

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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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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