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Share based compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Activity
The following table summarizes activities of the Company’s RSUs for the years ended December 31, 2022 and 2023:
Number of
RSUs
Weighted
Average
Exercise Price
Weighted
Average
Fair value at
grant date
Weighted
remaining
contractual
years
Aggregate
intrinsic
value
US$US$
Outstanding at January 1, 202218,995,5950.23 5.10  
Granted (new RSUs)6,680,5600.56 6.92 — 
Granted (replacement RSUs)3,419,8110.13 1.47 — 
Forfeited(1,244,394)0.54 4.97 — 
Replaced(3,419,811)1.24 1.47 — 
Outstanding at December 31, 202224,431,7610.15 5.60  
Granted (new RSUs)4,803,0351.98 1.65 — 
Granted (replacement RSUs)4,175,3520.21 4.88 — 
Forfeited(1,336,110)0.29 5.13 — 
Replaced(4,175,352)0.63 4.11 — 
Exercised (12,864,832)0.05 — — 
Outstanding at December 31, 202315,033,8540.69 4.91  
Vested and expected to vest as of December 31, 202315,033,8540.69 4.91 8.6660,132 
Exercisable as of December 31, 202313,571,7540.42 5.36 8.5360,959 
The following table summarizes activities of the options for the years ended December 31, 2022 and 2023:
Number of
options
Weighted
Average
Exercise Price
Weighted
Average
Fair value at
grant date
Weighted
remaining
contractual
years
Aggregate
intrinsic
value
US$US$
Outstanding at January 1, 202213,281,0439.70 2.92 
Granted 2,354,7449.70 3.39 
Forfeited (2,782,423)9.70 2.31 
Outstanding at December 31, 202212,853,3649.70 3.14 
Granted 157,3684.21 3.12 
Forfeited (1,750,014)9.70 3.32 
Outstanding at December 31, 202311,260,7189.62 3.11 
Vested and expected to vest as of December 31, 202311,260,7189.62 3.11 7.73— 
Exercisable as of December 31, 20238,815,5749.60 2.94 7.72— 
Summary of fair value of options granted that are estimated using the binomial model
The fair value of the RSUs granted in 2021, 2022 and 2023 under the 2019 RSU Plan was estimated using the binomial model with the following assumptions used:
Year ended December 31,
202120222023
Risk-free rate of return
0.35% – 2.70%
1.61% - 4.12%
2.65% - 4.25%
Volatility
41.13% – 50.60%
44.15% - 48.12%
44.58% - 44.73%
Expected dividend yield0.0 %0.0 %0.0 %
Fair value of underlying ordinary share
US$4.26-US$7.45
(equivalent to RMB27.97-RMB47.51)
US$7.57-US$9.05
(equivalent to RMB48.29-RMB64.98)
US$3.68 - US$6.91
(equivalent to RMB26.46-RMB49.90)
Expected terms10 years10 years10 years
The fair value of the options granted in 2021, 2022 and 2023 was estimated using the binomial model with the following assumptions used:
Year ended December 31,
202120222023
Risk-free rate of return
1.20% – 1.65%
1.63% – 3.83%
3.79% – 3.88%
Volatility
44.03% – 44.47%
44.18% – 45.07%
44.37% – 44.95%
Expected dividend yield0.0 %0.0 %0.0 %
Fair value of underlying ordinary share
US$6.99 – US$7.55
US$7.57 – US$9.30
US$3.16 –
 US$8.02
Expected terms 10 years10 years10 years
Summary of compensation expense recognized for RSUs
Compensation expense recognized for RSUs for the years ended December 31, 2021, 2022 and 2023 is allocated as follows:
Year ended December 31,
202120222023
RMBRMBRMB
Research and development expenses80,872 42,986 26,590 
Selling, general and administrative expenses76,085 481,567 139,340 
Cost of revenues6,524 — — 
Total163,481 524,553 165,930 
Compensation expense recognized for options for the years ended December 31, 2022 and 2023 is allocated as follows.
Year ended December 31,
20222023
RMBRMB
Research and development expenses93,824 1,205 
Selling, general and administrative expenses107,274 6,890 
Total201,098 8,095