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Redeemable Convertible Preferred Shares - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands					12 Months Ended
	Oct. 20, 2017 $ / shares shares	Feb. 09, 2015 USD ($) $ / shares shares	Feb. 13, 2014 USD ($) $ / shares shares	Sep. 13, 2012 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Jun. 30, 2012 $ / shares
Temporary Equity [Line Items]
Convertible redeemable preferred shares, issued, price per share | $ / shares								$ 0.5300	$ 0.7200	$ 1.422
Share split, description					Each of ordinary share and preferred share of the Company was subdivided into 100 shares at a par value of US$0.00001
Preferred stock shares converted and designated	100
Ordinary shares, par value | $ / shares	$ 0.00001							$ 0.00001			$ 0.00001
Preferred shares, par value | $ / shares	$ 0.00001
Preferred shares accretion recognized | ¥					¥ 0	¥ 0	¥ 3,073,471
Series A Convertible Redeemable Preferred Shares [Member]
Temporary Equity [Line Items]
Convertible redeemable preferred shares, issued | shares				2,850,000
Proceeds from issuance of convertible redeemable preferred shares | $				$ 4,560
Convertible redeemable preferred shares, issued, price per share | $ / shares				$ 1.60
Convertible redeemable preferred shares, outstanding | shares	285,000,000
Series B Convertible Redeemable Preferred Shares [Member]
Temporary Equity [Line Items]
Convertible redeemable preferred shares, issued | shares			2,142,857
Proceeds from issuance of convertible redeemable preferred shares | $			$ 15,000
Convertible redeemable preferred shares, issued, price per share | $ / shares			$ 7.00
Convertible redeemable preferred shares, outstanding | shares	214,285,700
Series C Convertible Redeemable Preferred Shares [Member]
Temporary Equity [Line Items]
Convertible redeemable preferred shares, issued | shares		2,345,547
Proceeds from issuance of convertible redeemable preferred shares | $		$ 46,667
Convertible redeemable preferred shares, issued, price per share | $ / shares		$ 19.90
Convertible redeemable preferred shares, outstanding | shares	234,554,700

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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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