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Convertible Redeemable Preferred Shares - Issuances (Details) - ¥ / shares | 1 Months Ended | 4 Months Ended
--- | --- | ---
Aug. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2016 | Nov. 30, 2016 | May 31, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2012 | Nov. 30, 2011 | Jan. 31, 2018
Series A-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  |  |  |  |  |  | ¥ 0.01 |
New issuance (in shares) | 65,307,000 |  |  |  |  |  |  |  |  | 62,273,127 |
Series A-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  |  |  |  |  | ¥ 0.06 |  |
New issuance (in shares) | 101,261,000 |  |  |  |  |  |  |  | 81,008,717 |  |
Series B-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  |  |  |  | ¥ 1.24 |  |  |
New issuance (in shares) | 250,302,000 |  |  |  |  |  |  | 200,241,529 |  |  |
Series B-2 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  |  | ¥ 3.21 |  |  |  |  |
New issuance (in shares) | 14,593,000 |  |  |  |  | 11,674,379 |  |  |  |  |
Series B-3 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  | ¥ 3.12 |  |  | ¥ 1.24 |  |  |
New issuance (in shares) | 56,105,000 | 17,215,818 | 10,027,455 |  | 7,220,212 |  |  | 12,141,515 |  |  |
Series B-4 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  | ¥ 3.21 |  |  | ¥ 3.21 |  |  |  |
New issuance (in shares) | 20,982,000 | 11,643,239 |  | 2,334,688 |  |  | 7,004,073 |  |  |  |
Series C-1 Convertible Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Issuance price per share (in US dollar per share) |  |  |  |  |  |  |  |  |  |  | ¥ 1.53
New issuance (in shares) | 164,876,000 |  |  |  |  |  |  |  |  |  | 164,876,000

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