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Share based compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share based compensation |
Summary of activities of Company's RSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ |  | ​ | Weighted | ​ | Weighted | ​ |
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Average | ​ | Fair value at | ​ | contractual | ​ | intrinsic
​ |  | RSUs |  | Exercise Price |  | grant date |  | years |  | value
​ | ​ | ​ |  | US$ |  | US$ | ​ | ​ | ​ | ​
Outstanding at January 1, 2021 |  | 16,224,217 |  | 0.05 |  | 3.66 | ​ | — | ​ | —
Granted (new RSUs) |  | 2,890,674 |  | 1.23 |  | 5.15 | ​ | — | ​ | —
Granted (replacement RSUs) |  | 7,708,362 |  | 0.28 |  | 6.88 | ​ | — | ​ | —
Forfeited |  | (119,296) |  | 0.01 |  | 3.71 | ​ | — | ​ | —
Replaced |  | (7,708,362) |  | 0.28 |  | 3.89 | ​ | — | ​ | —
Outstanding at December 31, 2021 | ​ | 18,995,595 | ​ | 0.23 | ​ | 5.10 | ​ | — | ​ | —
Granted (new RSUs) | ​ | 6,680,560 | ​ | 0.56 | ​ | 6.92 | ​ | — | ​ | —
Granted (replacement RSUs) | ​ | 3,419,811 | ​ | 0.13 | ​ | 1.47 | ​ | — | ​ | —
Forfeited | ​ | (1,244,394) | ​ | 0.54 | ​ | 4.97 | ​ | — | ​ | —
Replaced | ​ | (3,419,811) | ​ | 1.24 | ​ | 1.47 | ​ | — | ​ | —
Outstanding at December 31, 2022 |  | 24,431,761 |  | 0.15 |  | 5.60 | ​ | — | ​ | —
Vested and expected to vest as of December 31, 2022 |  | 24,431,761 |  | 0.15 |  | 5.60 |  | 7.80 |  | 5.76
Exercisable as of December 31, 2022 |  | 21,191,690 |  | 0.06 |  | 5.79 |  | 7.91 |  | 5.83
Summary of fair value of RSUs granted that are estimated using the binomial model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
Risk-free rate of return |  | 0.17% – 2.91% | ​ | 0.35% – 2.70% |  | 1.61% – 4.12%
Volatility |  | 44.68% – 54.39% | ​ | 41.13% – 50.60% | ​ | 44.15% – 48.12%
Expected dividend yield |  | 0.0% | ​ | 0.0% | ​ | 0.0%
Fair value of underlying ordinary share |  | US$3.16 – US$4.03 (equvalent to RMB 21.76 – RMB 26.27) | ​ | US$4.26 – US$7.45 (equvalent to RMB 27.97 – RMB 47.51) |  | US$7.57 – US$9.05 (equvalent to RMB 48.29 – RMB 64.98)
Expected terms |  | 10 years | ​ | 10 years |  | 10 years
Summary of activities of options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ |
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Average | ​ | Fair value at | ​ | contractual | ​ | intrinsic
​ |  | options |  | Exercise Price |  | grant date |  | years |  | value
​ | ​ | ​ |  | US$ |  | US$ | ​ | ​ | ​ | ​
Outstanding at January 1, 2021 |  | — |  | — |  | — |  | ​ | ​ | ​
Granted |  | 13,575,733 |  | 9.70 |  | 2.92 |  | ​ | ​ | ​
Forfeited |  | (294,690) |  | 9.70 |  | 2.92 |  | ​ | ​ | ​
Outstanding at December 31, 2021 | ​ | 13,281,043 | ​ | 9.70 | ​ | 2.92 | ​ | ​ | ​ | ​
Granted | ​ | 2,354,744 | ​ | 9.70 | ​ | 3.39 | ​ | ​ | ​ | ​
Forfeited | ​ | (2,782,423) | ​ | 9.70 | ​ | 2.31 | ​ | ​ | ​ | ​
Outstanding at December 31, 2022 |  | 12,853,364 |  | 9.70 |  | 3.14 |  | ​ | ​ | ​
Vested and expected to vest as of December 31, 2021 |  | 12,853,364 |  | 9.70 |  | 3.14 |  | 8.76 |  | —
Exercisable as of December 31, 2022 |  | 6,843,970 |  | 9.70 |  | 2.92 |  | 8.67 |  | —
Summary of fair value of options granted that are estimated using the binomial model | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Year ended December 31, |
​ | ​ | 2021 | ​ | 2022 |
Risk-free rate of return | ​ | 1.20% – 1.65 | % | 1.63% - 3.83 | %
Volatility | ​ | 44.03% – 44.47 | % | 44.18% - 45.07 | %
Expected dividend yield |  | 0.0 | % | 0.0 | %
Fair value of underlying ordinary share |  | US$6.99 - US$7.55 | ​ | US$7.57 - US$9.30 | ​
Expected terms |  | 10 | years | 10 | years
2019 RSU Plan |
Share based compensation |
Summary of compensation expense recognized for RSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2020 | ​ | 2021 |  | 2022
​ | ​ | RMB | ​ | RMB | ​ | RMB
Research and development expenses |  | 6,501 | ​ | 80,872 |  | 42,986
Selling and marketing expenses |  | 723 | ​ | 7,321 |  | 8,297
Cost of revenues |  | — | ​ | 6,524 |  | —
General and administrative expenses |  | 4,186 | ​ | 68,764 |  | 473,270
Total |  | 11,410 | ​ | 163,481 |  | 524,553
2021 Option Plan |
Share based compensation |
Summary of compensation expense recognized for RSUs | ​
​ | ​ | ​
​ |  | Year ended December 31,
​ | ​ | 2022
​ | ​ | RMB
Research and development expenses | ​ | 93,824
Selling and marketing expenses | ​ | 8,554
General and administrative expenses | ​ | 98,720
Total | ​ | 201,098

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