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Share-based Compensation - 2019 Incentive Plan (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
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Sep. 07, 2019 shares | Sep. 30, 2019 $ / shares | Sep. 30, 2019 CNY (¥) shares | Dec. 31, 2019 $ / shares | Dec. 31, 2019 CNY (¥) ¥ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Sep. 30, 2019 $ / shares shares
2019 Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under the plan (in shares) |  |  |  |  |  |  |  | 137,186,000
Cancelled (in shares) |  |  |  |  | 3,187,546 |  |  |
Exercise price (in US dollars per share) | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Incremental compensation cost | ¥ |  |  | ¥ 0 |  |  |  |  |
Number of share options granted (in shares) |  |  |  |  | 129,590,471 |  |  |
Assumptions |  |  |  |  |  |  |  |
Expected volatility | 50.22% |  |  |  |  |  |  |
Contractual term (in year) | 10 years |  |  |  |  |  |  |
Risk-free interest rate | 1.66% |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |
Granted during the year |  |  |  |  | 129,590,471 |  |  |
Forfeited during the year |  |  |  |  | (3,187,546) |  |  |
Ending balance |  |  |  |  | 126,402,925 |  |  |
Weighted average exercise price US$/Share |  |  |  |  |  |  |  |
Outstanding at beginning of period | $ / shares |  |  |  |  |  |  |  |
Granted during the year | $ / shares |  |  |  | 0.0001 |  |  |  |
Forfeited during the year | $ / shares |  |  |  | 0.0001 |  |  |  |
Outstanding at end of period | $ / shares |  | 0.0001 |  | 0.0001 |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |
Aggregate intrinsic value US$ | $ |  |  |  |  |  | $ 37,352,064 |  |
Weighted average remaining contractual years |  |  |  |  |  |  |  |
Weighted average remaining contractual years |  |  |  |  | 9 years 8 months 5 days |  |  |
Weighted average price of options granted during the year | $ / shares |  |  |  | 0.0001 |  |  |  |
Unrecognized share-based compensation expenses, recognition period |  |  |  |  | 2 years 7 months 21 days |  |  |
Weighted average grant date fair value of share options | (per share) |  |  |  | $ 0.55 | ¥ 3.81 |  |  |
Share-based compensation expenses recognized for share options | ¥ |  |  |  |  | ¥ 61,250 |  |  |
Unrecognized share-based compensation expenses | ¥ |  |  |  |  |  |  | ¥ 87,440 |
Unrecognized compensation expense, recognition period |  |  |  |  | 2 years 7 months 21 days |  |  |
2019 Incentive Plan | Class A ordinary shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized under the plan (in shares) |  |  |  |  |  | 7,595,529 | 7,595,529 |
2014 and 2016 Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Cancelled (in shares) |  |  | 91,548,120 |  |  |  |  |
Exercise price (in US dollars per share) | $ / shares |  | 0 |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |
Forfeited during the year |  |  | (91,548,120) |  |  |  |  |
Weighted average exercise price US$/Share |  |  |  |  |  |  |  |
Outstanding at beginning of period | $ / shares |  | $ 0 |  |  |  |  |  |
Employee options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 4 years |  |  |
Expiration period (in years) |  |  |  |  | 10 years |  |  |
Certain Directors And Senior Management | 2019 Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of share options granted (in shares) | 38,042,351 |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |
Granted during the year | 38,042,351 |  |  |  |  |  |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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