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Redeemable Convertible Preferred Shares - Redeemable Convertible Preferred Shares (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands									12 Months Ended
	Nov. 01, 2019 shares	Oct. 08, 2019 CNY (¥) shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2015 CNY (¥) shares	Jun. 12, 2014 USD ($) $ / shares shares	Jun. 12, 2014 CNY (¥) shares	Oct. 25, 2013 USD ($) $ / shares shares	Oct. 25, 2013 CNY (¥) shares	Dec. 31, 2019 item shares	Jun. 12, 2019	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares
Redeemable Convertible Preferred Shares
Rounds of financing issuing preferred shares since inception | item									4
Redemption price (as a percent)										150.00%
Liquidation preference, percentage of original issue price									150.00%
Series A preferred shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)							259,257,900	259,257,900
Series A-1 Convertible Preferred Shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)							111,110,000	111,110,000
Shares repurchased (in shares)			9,007,682	9,007,682
Total consideration on shares repurchased			$ 7,000	¥ 42,000
Shares issued for each shares converted							1
Series A-2 Redeemable Convertible Preferred Shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)							148,147,900	148,147,900
Shares issue price per share | $ / shares							$ 0.07
Total consideration on shares issued							$ 9,830	¥ 58,980
Series B Redeemable Convertible Preferred Shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)					177,834,496	177,834,496
Shares issue price per share | $ / shares					$ 0.25
Total consideration on shares issued					$ 45,000	¥ 276,764
Threshold minimum percentage of outstanding preferred share holders to provide written consent									75.00%
Series C Redeemable Convertible Preferred Shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)			286,959,017	286,959,017
Shares issue price per share | $ / shares			$ 0.78
Total consideration on shares issued			$ 223,000	¥ 1,364,046
Ordinary shares
Redeemable Convertible Preferred Shares
Shares repurchased (in shares)			29,596,670	29,596,670
Total consideration on shares repurchased			$ 23,000	¥ 140,612
Shares issued for each shares converted											1	1	1
Class A ordinary shares
Redeemable Convertible Preferred Shares
Issuance of Class A ordinary shares upon initial public offering ("IPO"), net of offering cost (in shares)	150,000,000								162,504,475
Series C preferred shareholder | Class A ordinary shares
Redeemable Convertible Preferred Shares
Stock Options Granted		172,908,894
Stock options, Threshold exercisable period		61 days
Grant date fair value of stock options granted | ¥		¥ 642,174

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Grant date fair value of options granted. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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The threshold period after the completion of the offering, during which the options can be exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of original issue price, that each holder of the convertible redeemable preferred shares, that is classified as temporary equity, are entitled to receive, upon any liquidation including deemed liquidation, dissolution or winding up of the company.

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The percentage of original issue price, that each holder of the convertible redeemable preferred shares, that is classified as temporary equity, are entitled to receive, upon redemption.

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Threshold minimum percentage of outstanding preferred share holders to provide written consent for automatic conversion of convertible preferred stock.

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Number of shares issued for each share of convertible preferred stock that is converted.

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The cash outflow to reacquire common and preferred stock.

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The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

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Gross number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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Number of new stock issued during the period.

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