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Share based compensation - Activities of Company's RSUs (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Number of RSUs |  |
Outstanding at the beginning | 18,995,595 | 16,224,217
Granted (new RSUs) | 6,680,560 | 2,890,674
Granted (replacement RSUs) | 3,419,811 | 7,708,362
Forfeited | (1,244,394) | (119,296)
Replaced | (3,419,811) | (7,708,362)
Outstanding at the end | 24,431,761 | 18,995,595
Vested and expected to vest as of December 31, 2021 | 24,431,761 |
Exercisable as of December 31, 2021 | 21,191,690 |
Weighted Average Exercise Price |  |
Outstanding at the beginning | $ 0.23 | $ 0.05
Granted (new RSUs) | 0.56 | 1.23
Granted (replacement RSUs) | 0.13 | 0.28
Forfeited | 0.54 | 0.01
Replaced | 1.24 | 0.28
Outstanding at the end | 0.15 | 0.23
Vested and expected to vest as of December 31, 2021 | 0.15 |
Exercisable as of December 31, 2021 | 0.06 |
Weighted Average Fair value at grant date |  |
Outstanding at the beginning | 5.10 | 3.66
Granted (new RSUs) | 6.92 | 5.15
Granted (replacement RSUs) | 1.47 | 6.88
Forfeited | 4.97 | 3.71
Replaced | 1.47 | 3.89
Outstanding at the end | 5.60 | $ 5.10
Vested and expected to vest as of December 31, 2021 | 5.60 |
Exercisable as of December 31, 2021 | $ 5.79 |
Weighted remaining contractual years |  |
Vested and expected to vest as of December 31, 2021 | 7 years 9 months 18 days |
Exercisable as of December 31, 2021 | 7 years 10 months 28 days |
Aggregate intrinsic value |  |
Vested and expected to vest as of December 31, 2021 | $ 5.76 |
Exercisable as of December 31, 2021 | $ 5.83 |

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