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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-based Compensation |
Summary of share options activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted |  | Weighted |  | ​
​ | ​ | ​ | ​ | average | ​ | average | ​ | average | ​ | ​
​ | ​ | ​ | ​ | exercise | ​ | grant date | ​ | remaining | ​ | Aggregate
​ | ​ | Number of | ​ | price per | ​ | fair value per | ​ | contractual | ​ | intrinsic
​ |  | shares |  | share |  | share |  | term |  | value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | US$
Outstanding as of December 31, 2020 |  | 48,740,000 |  | 0.33 |  | 1.05 |  | 7.02 |  | 591,879
Granted |  | 18,035,000 |  | 0.24 |  | 12.55 |  |  |  |
Exercised | ​ | (5,403,461) | ​ | 0.14 | ​ | 0.68 | ​ | ​ | ​ | ​
Forfeited |  | (1,410,000) |  | 0.31 |  | 7.21 |  |  |  |
Outstanding as of December 31, 2021 |  | 59,961,539 |  | 0.17 |  | 4.40 |  | 6.95 |  | 364,287
Granted | ​ | 2,765,000 | ​ | 0.20 | ​ | 3.27 | ​ | ​ | ​ | ​
Exercised | ​ | (4,502,326) | ​ | 0.20 | ​ | 2.09 | ​ | ​ | ​ | ​
Forfeited | ​ | (1,950,000) | ​ | 0.47 | ​ | 7.69 | ​ | ​ | ​ | ​
Outstanding as of December 31, 2022 | ​ | 56,274,213 | ​ | 0.16 | ​ | 4.42 | ​ | 6.04 | ​ | 98,287
Granted | ​ | — | ​ | — | ​ | — | ​ | ​ | ​ | ​
Exercised | ​ | (3,770,958) | ​ | 0.31 | ​ | 3.54 | ​ | ​ | ​ | ​
Forfeited | ​ | (831,250) | ​ | 0.36 | ​ | 7.16 | ​ | ​ | ​ | ​
Outstanding as of December 31, 2023 | ​ | 51,672,005 | ​ | 0.15 | ​ | 4.44 | ​ | 4.95 | ​ | 105,285
Summary of assumptions used to value the Company's options grants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
​ |  | 2021 |  | 2022 |  | 2023 |
Exercise price (US Dollar) |  | 0.2~2.88 |  | 0.2 | ​ | N/A | ​
Exercise multiple |  | 2.2~2.8 |  | 2.2~2.8 | ​ | N/A | ​
Risk-free interest rate |  | 1.13%~1.79 | % | 1.92%~3.22 | % | N/A | ​
Expected term (in years) |  | 10 |  | 10 | ​ | N/A | ​
Expected dividend yield |  | — |  | — | ​ | N/A | ​
Expected volatility |  | 50.40%~55.79 | % | 55.68%~55.78 | % | N/A | ​
Expected forfeiture rate (post-vesting) |  | 2.96%~5.83 | % | 5.83%~7.70 | % | N/A | ​
Fair value of the underlying shares on the date of options grants (US Dollar) |  | 6.25~20.91 |  | 2.24~5.46 | ​ | N/A | ​
Fair value of share option (US Dollar) |  | 5.78~20.91 |  | 2.05~5.27 | ​ | N/A | ​
Summary of service - based RSUs activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | Weighted average grant
​ |  | Number of shares |  | date fair value per share
Outstanding as of December 31, 2020 |  | — |  | —
Granted |  | 3,217,000 |  | 8.95
Forfeited |  | (167,000) |  | 11.80
Outstanding as of December 31, 2021 |  | 3,050,000 |  | 8.80
Granted | ​ | 10,205,500 | ​ | 2.58
Vested | ​ | (346,000) | ​ | 6.68
Forfeited | ​ | (1,270,750) | ​ | 7.80
Outstanding as of December 31, 2022 | ​ | 11,638,750 | ​ | 3.51
Granted | ​ | 1,181,000 | ​ | 1.79
Vested | ​ | (2,276,875) | ​ | 4.76
Forfeited | ​ | (1,219,750) | ​ | 4.34
Outstanding as of December 31, 2023 | ​ | 9,323,125 | ​ | 2.88

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