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Convertible Preferred Shares - Accounting for Convertible Preferred Shares (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) shares | Feb. 28, 2017 CNY (¥) shares | Feb. 29, 2016 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Convertible Preferred Shares |  |  |  |  |  |  |  |
Excess of the issuance price paid by investor over fair value encounter as contribution from shareholder |  |  |  |  |  |  | ¥ 26,413 |
Proceeds from issuance of Convertible Preferred Shares |  |  |  |  |  | ¥ 5,824,568 | 1,446,906 |
Increase to fair value of modified Convertible Preferred Shares as deemed dividends |  |  |  | ¥ 80,496 | $ 11,708 | 80,496 |  |
General and administrative expenses |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Share-based compensation expense recognized on repurchase of ordinary shares |  | ¥ 103,125 |  |  |  |  |  |
Series C1 convertible preferred shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Excess of the issuance price paid by investor over fair value encounter as contribution from shareholder |  | ¥ 26,413 |  |  |  |  |  |
Series B1 convertible preferred shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Deemed distribution |  |  |  |  |  |  |  | ¥ 12,104
Series B2 convertible preferred shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Special cash dividend approved |  |  | ¥ 18,326 |  |  |  |  |
Series B1 Convertible Preferred Shares and Series B4 Convertible Preferred Shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Deemed distribution |  |  |  |  |  | ¥ 0 | ¥ 0 |
Class B ordinary shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Repurchased and cancellation of Class B ordinary shares | shares |  | 56,430,180 |  |  |  |  |  |
Proceeds from issuance of Convertible Preferred Shares |  | ¥ 137,580 |  |  |  |  |  |
Class B ordinary shares | Accumulated Deficits |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Share-based compensation expense recognized on repurchase of ordinary shares |  | ¥ 32,677 |  |  |  |  |  |
Series D Convertible Preferred Shares |  |  |  |  |  |  |  |
Convertible Preferred Shares |  |  |  |  |  |  |  |
Number of shares issued | shares | 551,174,340 |  |  |  |  |  |  |
Proceeds from issuance of Convertible Preferred Shares | $ | $ 918,670 |  |  |  |  |  |  |

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