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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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The amount of contribution from a holder of convertible preferred shares.

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Amount of deemed distribution to certain holders of convertible preferred shares.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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