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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 |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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