Maximum amount of common shares permitted to be issued by an entity's charter and bylaws.

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Number of share conversion resulted in an increase in ordinary shares.

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Number of votes per share that each shareholder is entitled.

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Ordinary shares conversion ratio, which applies to ordinary shares converted into Class A or Class B ordinary shares.

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Preferred shares conversion ratio.

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Represents the information pertaining to the number of shares on re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Maximum number of common units of ownership permitted to be issued by a limited liability company (LLC).

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Number of common units issued of limited liability company (LLC).

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and 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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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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Ordinary Shares (Details) ¥ / shares in Units, $ / shares in Units, $ in Thousands, ¥ in Millions			1 Months Ended											4 Months Ended	12 Months Ended
	Nov. 08, 2019 $ / shares shares	Nov. 07, 2019 shares	Oct. 31, 2019 CNY (¥) shares	Aug. 31, 2019 shares	Apr. 30, 2019 shares	Mar. 31, 2019 shares	Dec. 31, 2016 ¥ / shares shares	Nov. 30, 2016 ¥ / shares shares	May 31, 2016 ¥ / shares shares	Mar. 31, 2016 ¥ / shares shares	Sep. 30, 2015 ¥ / shares shares	Jun. 30, 2012 ¥ / shares shares	Nov. 30, 2011 ¥ / shares shares	Jan. 31, 2018 ¥ / shares shares	Dec. 31, 2019 Vote $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 shares
Ordinary Shares
Authorized share capital \| $																$ 50,000
authorized share capital (in shares)				5,000,000,000												500,000,000
Par value (in US dollar per share) \| $ / shares															$ 0.0001	$ 0.0001
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering (in shares)		96,082,700
Preferred shares conversion ratio		1
Shares issued (in shares)																1
Ordinary shares, shares authorized (in shares)				4,326,574,000											0	4,326,574,000
Ordinary shares, shares issued (in shares)				189,388,000											0	233,800,850
Ordinary shares, shares outstanding (in shares)				189,388,000											0	233,800,850
Shares issuable in connection to vested restricted share units (in shares)				63,567,850											61,006,382
Convertible redeemable preferred shares, shares outstanding (in shares)							383,898,240									548,774,240	483,347,240
Ordinary shares
Ordinary Shares
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering (in shares)															(237,849,382)
Share repurchase (in shares)			2,561,468												(2,561,468)
Employee consideration \| ¥			¥ 2.3
IPO
Ordinary Shares
Issuance price per share (in US dollar per share) \| $ / shares	$ 14.50
Ordinary shares increased results of conversion rate	44,521
IPO \| ADS
Ordinary Shares
New issuance (in shares)	1,380,000
Issuance price per share (in US dollar per share) \| $ / shares	$ 14.50
Series A-1 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				65,307,000											0	62,273,127
Convertible redeemable preferred shares, shares issued (in shares)				65,307,000											0	62,273,127
Convertible redeemable preferred shares, shares outstanding (in shares)				65,307,000			62,273,127								0	62,273,127	62,273,127
New issuance (in shares)				65,307,000									62,273,127
Issuance price per share (in US dollar per share) \| ¥ / shares													¥ 0.01
Series A-2 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				101,261,000											0	81,008,717
Convertible redeemable preferred shares, shares issued (in shares)				101,261,000											0	81,008,717
Convertible redeemable preferred shares, shares outstanding (in shares)				101,261,000			81,008,717								0	81,008,717	81,008,717
New issuance (in shares)				101,261,000								81,008,717
Issuance price per share (in US dollar per share) \| ¥ / shares												¥ 0.06
Series B-1 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				250,302,000											0	200,241,529
Convertible redeemable preferred shares, shares issued (in shares)				250,302,000											0	200,241,529
Convertible redeemable preferred shares, shares outstanding (in shares)				250,302,000			200,241,529								0	200,241,529	200,241,529
New issuance (in shares)				250,302,000							200,241,529
Issuance price per share (in US dollar per share) \| ¥ / shares											¥ 1.24
Series B-2 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				14,593,000											0	11,674,379
Convertible redeemable preferred shares, shares issued (in shares)				14,593,000											0	11,674,379
Convertible redeemable preferred shares, shares outstanding (in shares)				14,593,000			11,674,379								0	11,674,379	11,674,379
New issuance (in shares)				14,593,000					11,674,379
Issuance price per share (in US dollar per share) \| ¥ / shares									¥ 3.21
Series B-3 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				56,105,000											0	19,361,727
Convertible redeemable preferred shares, shares issued (in shares)				56,105,000											0	19,361,727
Convertible redeemable preferred shares, shares outstanding (in shares)				56,105,000			19,361,727								0	19,361,727	19,361,727
New issuance (in shares)				56,105,000	17,215,818	10,027,455		7,220,212			12,141,515
Issuance price per share (in US dollar per share) \| ¥ / shares								¥ 3.12			¥ 1.24
Series B-4 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				20,982,000											0	9,338,761
Convertible redeemable preferred shares, shares issued (in shares)				20,982,000											0	9,338,761
Convertible redeemable preferred shares, shares outstanding (in shares)				20,982,000			9,338,761								0	9,338,761	9,338,761
New issuance (in shares)				20,982,000	11,643,239		2,334,688			7,004,073
Issuance price per share (in US dollar per share) \| ¥ / shares							¥ 3.21			¥ 3.21
Series C-1 Convertible Redeemable Preferred Stock
Ordinary Shares
Convertible redeemable preferred shares, shares authorized (in shares)				164,876,000											0	164,876,000
Convertible redeemable preferred shares, shares issued (in shares)				164,876,000											0	164,876,000
Convertible redeemable preferred shares, shares outstanding (in shares)				164,876,000											0	164,876,000	99,449,000
New issuance (in shares)				164,876,000										164,876,000
Issuance price per share (in US dollar per share) \| ¥ / shares														¥ 1.53
Class A ordinary shares
Ordinary Shares
Par value (in US dollar per share) \| $ / shares	$ 0.0001														$ 0.0001	$ 0.0001
Ordinary shares conversion ratio		1
Ordinary shares, shares authorized (in shares)															4,903,917,300	0
Ordinary shares, shares issued (in shares)															841,275,820	0
Ordinary shares, shares outstanding (in shares)															841,275,820
Number of votes per share \| Vote															1
Class A ordinary shares \| Ordinary shares
Ordinary Shares
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering (in shares)															141,766,682
New issuance (in shares)															34,500,000
Class A ordinary shares \| IPO
Ordinary Shares
New issuance (in shares)	34,500,000
Number of shares issued on conversion	40,044,520
Class B ordinary shares
Ordinary Shares
Par value (in US dollar per share) \| $ / shares	$ 0.0001														$ 0.0001
Ordinary shares conversion ratio		1
Shares issued (in shares)															96,082,700
Ordinary shares, shares authorized (in shares)															96,082,700	0
Ordinary shares, shares issued (in shares)															96,082,700	0
Ordinary shares, shares outstanding (in shares)															96,082,700	0
Number of votes per share \| Vote															25
Class B ordinary shares \| Ordinary shares
Ordinary Shares
Re-designation of ordinary shares into Class A and Class B ordinary shares upon initial public offering (in shares)															96,082,700