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Convertible Redeemable Preferred Shares - Conversion right, Dividend right, Liquidation preference, Redemption rights (Details) | 12 Months Ended |  |
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Dec. 31, 2019 CNY (¥) factor shares | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Convertible Redeemable Preferred Shares |  |  |
Dividend declared | ¥ | ¥ 0 | ¥ 0 | ¥ 0
Percentage of voting | 50.00% |  |
Liquidation amount as percentage of temporary equity issue price | 100.00% |  |
Payment term of redemption right (in days) | 90 days |  |
Ordinary shares |  |  |
Convertible Redeemable Preferred Shares |  |  |
Conversion ratio of preferred shares to ordinary shares | shares | 1 |  |
Series A-1 A-2 B-1 B-2 B-3 B-4 C-1 D Convertible Redeemable Preferred Stock [Member] |  |  |
Convertible Redeemable Preferred Shares |  |  |
Factor in calculating dividend | 8 |  |
Series C-1 Convertible Redeemable Preferred Stock |  |  |
Convertible Redeemable Preferred Shares |  |  |
Redemption price as a percentage on issue price | 10.00% |  |
Series D And C-1 Redeemable Preferred Shares [Member] |  |  |
Convertible Redeemable Preferred Shares |  |  |
Factor included in liquidation calculation | 12 |  |
Factor included in calculation of redemption price | 10 |  |
Preferred shares | Series B-1, B-2, B-3, and B-4 convertible redeemable preferred shares |  |  |
Convertible Redeemable Preferred Shares |  |  |
Redemption price as a percentage on issue price | 120.00% |  |
Preferred shares | Series A-2 Convertible Redeemable Preferred Stock |  |  |
Convertible Redeemable Preferred Shares |  |  |
Redemption price as a percentage on issue price | 300.00% |  |

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