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Share-Based Compensation - Summary of Group's option activities (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares
Weighted average remaining contractual term |  |  |  |  |  |  |  |
Fair value of vested options | $ 322,191 | ¥ 2,243,028 |  | ¥ 45,979 |  | ¥ 13,525 |  |
Unrecognized share-based compensation expense relating to unvested options | $ 1,435,609 |  |  |  |  |  |  | ¥ 9,994,423
Weighted-average period for recognition of share-based compensation expense relating to unvested options | 4 years 9 months 29 days | 4 years 9 months 29 days |  |  |  |  |  |
2015 Plan and the 2018 Plan |  |  |  |  |  |  |  |
Number of share options |  |  |  |  |  |  |  |
Outstanding at beginning of the year (in shares) | shares | 629,592,860 | 629,592,860 | 272,442,860 | 272,442,860 | 203,733,060 | 203,733,060 |  |
Granted (in shares) | shares | 76,665,380 | 76,665,380 | 359,390,000 | 359,390,000 | 78,560,000 | 78,560,000 |  |
Forfeited (in shares) | shares | (7,937,140) | (7,937,140) | (2,240,000) | (2,240,000) | (9,850,200) | (9,850,200) |  |
Outstanding at end of the year (in shares) | shares | 698,321,100 | 698,321,100 | 629,592,860 | 629,592,860 | 272,442,860 | 272,442,860 | 203,733,060 |
Vested and expected to vest at end of the year (in shares) | shares | 698,321,100 |  |  |  |  |  |  | 698,321,100
Exercisable at end of the year (in shares) | shares | 298,464,265 |  |  |  |  |  |  | 298,464,265
Weighted average exercise price |  |  |  |  |  |  |  |
Outstanding at beginning of the year (in dollars per share) | $ 0.0065 |  | $ 0.0065 |  | $ 0.0065 |  |  |
Granted (in dollars per share) | 0.0065 |  | 0.0065 |  | 0.0065 |  |  |
Forfeited (in dollars per share) | 0.0065 |  | 0.0065 |  | 0.0065 |  |  |
Outstanding at end of the year (in dollars per share) | 0.0065 |  | 0.0065 |  | 0.0065 |  | $ 0.0065 |
Vested and expected to vest at end of the year (in dollars per share) | 0.0065 |  |  |  |  |  |  |
Exercisable at end of the year (in dollars per share) | 0.0065 |  |  |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  |  |  |
Outstanding at beginning of the year | 2.0931 |  | 0.0706 |  | 0.0301 |  |  |
Granted | 7.7632 |  | 3.6289 |  | 0.1736 |  |  |
Forfeited | 5.7059 |  | 2.5006 |  | 0.0544 |  |  |
Outstanding at end of the year | 2.6745 |  | $ 2.0931 |  | $ 0.0706 |  | $ 0.0301 |
Vested and expected to vest at end of the year | 2.6745 |  |  |  |  |  |  |
Exercisable at end of the year | $ 1.1083 |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |
Outstanding at beginning of the year (in dollars) | $ | $ 3,527,924 |  | $ 144,258 |  | $ 10,390 |  |  |
Outstanding at end of the year (in dollars) | $ | (6,598,087) |  | $ 3,527,924 |  | $ 144,258 |  | $ 10,390 |
Vested and expected to vest at end of the year (in dollars) | $ | 6,598,087 |  |  |  |  |  |  |
Exercisable at end of the year (in dollars) | $ | $ 2,820,040 |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  |  |  |  |  |  |
Outstanding (in years) | 7 years 9 months 29 days | 7 years 9 months 29 days | 8 years 7 months 20 days | 8 years 7 months 20 days | 8 years 6 months 25 days | 8 years 6 months 25 days | 9 years 3 months |
Vested and expected to vest at end of the year (in years) | 7 years 9 months 29 days | 7 years 9 months 29 days |  |  |  |  |  |
Exercisable at end of the year (in years) | 7 years 3 days | 7 years 3 days |  |  |  |  |  |

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- Definition 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. + 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 The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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