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Convertible Redeemable Preferred Shares - Re-designation (Details) | 1 Months Ended | 4 Months Ended | 12 Months Ended
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Sep. 30, 2019 USD ($) shares | Aug. 31, 2019 shares | Apr. 30, 2019 USD ($) shares | Apr. 30, 2019 CNY (¥) shares | Mar. 31, 2019 CNY (¥) shares | Dec. 31, 2016 shares | Nov. 30, 2016 shares | May 31, 2016 shares | Mar. 31, 2016 shares | Sep. 30, 2015 shares | Jun. 30, 2012 shares | Nov. 30, 2011 shares | Jan. 31, 2018 shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 CNY (¥) shares
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 100,000,000 | ¥ 152,000,000
Preferred shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,999,999 | 65,427,000 | 99,449,000
Series B-3 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 56,105,000 | 17,215,818 | 17,215,818 | 10,027,455 |  | 7,220,212 |  |  | 12,141,515 |  |  |  |  |  |
Total amount | ¥ |  |  |  | ¥ 30,896,752 | ¥ 27,140,000 |  |  |  |  |  |  |  |  |  |  |
Difference between the fair value and the par value of the ordinary shares | ¥ |  |  |  | ¥ 29,956,000 |  |  |  |  |  |  |  |  |  |  |  |
Difference between the fair value of the preferred shares and the fair value of the ordinary shares | $ |  |  | $ 11,230,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ (29,966,000) |  |
Series B-4 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 20,982,000 | 11,643,239 | 11,643,239 |  | 2,334,688 |  |  | 7,004,073 |  |  |  |  |  |  |
Total amount | ¥ |  |  |  | ¥ 36,756,000 |  |  |  |  |  |  |  |  |  |  |  |
Difference between the fair value and the par value of the ordinary shares | ¥ |  |  |  | ¥ 20,261,000 |  |  |  |  |  |  |  |  |  |  |  |
Difference between the fair value of the preferred shares and the fair value of the ordinary shares | $ |  |  | $ 15,554,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,268,000) |  |
Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 67,311,809 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | (309,984,000) |  |
Series A-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 65,307,000 |  |  |  |  |  |  |  |  |  | 62,273,127 |  |  |  |
Series A-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 101,261,000 |  |  |  |  |  |  |  |  | 81,008,717 |  |  |  |  |
Series B-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 250,302,000 |  |  |  |  |  |  |  | 200,241,529 |  |  |  |  |  |
Series B-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 14,593,000 |  |  |  |  |  | 11,674,379 |  |  |  |  |  |  |  |
Series C-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 164,876,000 |  |  |  |  |  |  |  |  |  |  | 164,876,000 |  |  |
Preferred shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,427,000 | 99,449,000
Series C-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ (36,977,000) |  |
Re-designation of ordinary shares into convertible redeemable preferred shares (in shares) |  | 12,545,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series D Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares issued (in shares) | 39,999,999 |  |  |  |  |  |  |  |  |  |  |  |  | 39,999,999 |  |
Aggregate Purchase Price | $ | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted share units | Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 12,927,101 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares | Series B-3 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ (10,000) |  |
Ordinary shares | Series B-4 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,000) |  |
Ordinary shares | Series A-1, A-2, B-1, B-2 and B-3 convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuance upon initial public offering, net of issuance costs of US$ (in shares) |  | 15,553,793 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,000) |  |
Ordinary shares | Series C-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Re-designation of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ (9,000) |  |

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