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Share-based Compensation (Tables) - 2019 Incentive Plan | 12 Months Ended
--- | ---
Dec. 31, 2023
Share-based Compensation |
Schedule of fair value assumptions on options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
​ |  | 2021 |  | 2022 |  | 2023 | ​
Expected volatility |  | 49.29%-50.47 | % | 51.97 | % | 53.06 | %
Expected dividend yield |  | — | ​ | — | ​ | — | ​
Contractual term (in year) |  | 10 | ​ | 10 | ​ | 10 | ​
Risk-free interest rate |  | 1.38%-1.45 | % | 3.57 | % | 3.77 | %
Summary of stock option activity under the 2019 Incentive Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted average
​ | ​ | ​ | ​ | average exercise | ​ | Aggregate intrinsic | ​ | remaining
​ |  | Number of |  | price US$ per |  | value |  | contractual
​ | ​ | shares | ​ | share | ​ | US$ | ​ | years
Outstanding at December 31, 2020 |  | 88,240,084 | ​ | 0.0001 | ​ | 9,847,593 | ​ | 8.77
Granted during the year | ​ | 32,765,413 | ​ | 0.0001 | ​ | — | ​ | —
Exercised during the year |  | (18,031,675) |  | 0.0001 |  | — | ​ | —
Forfeited / Cancelled during the year |  | (8,143,392) |  | 0.0001 |  | — | ​ | —
Outstanding at December 31, 2021 | ​ | 94,830,430 | ​ | 0.0001 | ​ | 4,324,268 | ​ | 8.44
Granted during the year |  | 3,167,881 |  | 0.0001 |  | — |  | —
Exercised during the year | ​ | (2,107,600) | ​ | 0.0001 | ​ | — | ​ | —
Forfeited during the year | ​ | (1,861,733) | ​ | 0.0001 | ​ | — | ​ | —
Outstanding at December 31, 2022 | ​ | 94,028,978 | ​ | 0.0001 | ​ | 3,881,516 | ​ | 7.53
Granted during the year | ​ | 875,004 | ​ | 0.0001 | ​ | — | ​ | —
Exercised during the year | ​ | (674,082) | ​ | 0.0001 | ​ | — | ​ | —
Forfeited during the year | ​ | (5,074,304) | ​ | 0.0001 | ​ | — | ​ | —
Outstanding at December 31, 2023 | ​ | 89,155,596 | ​ | 0.0001 | ​ | 1,997,085 | ​ | 6.62
Exercisable at December 31, 2023 | ​ | 76,201,677 | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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