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Share-Based Compensation - Additional information (Details) ¥ in Thousands, $ in Thousands		12 Months Ended
	Dec. 21, 2018 shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 shares
Share-Based Compensation
Share-based compensation expense		$ 107,138	¥ 745,873
Total unrecognized compensation expense | ¥			¥ 150,095
Total unrecognized compensation expense, weighted average recognition period		1 year 3 months 26 days	1 year 3 months 26 days
2018 Plan | Stock options
Share-Based Compensation
Maximum aggregate number of shares that may be issued	260,454,163
Stock Options Granted				175,978,312
Exercisable options (in shares)			66,176,296
2018 Plan | Vesting first year | Stock options
Share-Based Compensation
Percentage of Vesting rights	30.00%
Vesting Period	12 months
2018 Plan | Vesting second year | Stock options
Share-Based Compensation
Percentage of Vesting rights	30.00%
Vesting Period	24 months
2018 Plan | Vesting third year | Stock options
Share-Based Compensation
Percentage of Vesting rights	40.00%
Vesting Period	36 months

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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