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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Nonvested Restricted Share Units Activity
A summary of the changes in the Company’s unvested restricted share units during the nine months ended September 30, 2022 are as follows:
Number of SharesWeighted Average Grant Date Fair Value
Unvested and Outstanding as of December 31, 2021115,140 $10.19 
Granted143,830 $14.89 
Vested(31,975)$9.94 
Forfeited(600)$14.68 
Unvested and Outstanding as of September 30, 2022
226,395 $11.59 
Schedule of Share-based Payment Arrangement, Option, Activity
The following table summarizes the Company’s share options activity for the nine months ended September 30, 2022:
Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (Years)Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021
3,915,503 $13.53 8.64$51,162 
Granted2,000,783 $13.86 
Exercised(461,772)$0.77 
Forfeited(418,591)$9.38 
Outstanding as of September 30, 2022
5,035,923 $14.28 8.60$17,846 
Exercisable as of September 30, 2022
2,106,737 $7.07 7.82$15,544 
Unvested as of September 30, 2022
2,929,746 $16.68 9.16$2,302 
Schedule of Valuation Assumptions
The weighted-average assumptions used in the Black-Scholes option pricing model to determine the fair value of the share options granted to employees and directors during the nine months ended September 30, 2022, and 2021 were as follows:
Three Months Ended September 30,
Nine Months Ended September 30,
2022202120222021
Expected option life (years)6.086.075.946.07
Expected volatility81.40 %66.90 %80.72 %67.20 %
Risk-free interest rate2.70 %0.96 %2.15 %0.91 %
Expected dividend yield— %— %— %— %
Fair value of underlying ordinary shares$14.41 $34.83 $14.48 $37.65 
Summary of Share-based Compensation Expense
Share-based compensation expense recorded as research and development and general and administrative expenses is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Research and development1,936 1,288 5,558 3,023 
General and administrative1,568 999 4,252 2,834 
Total stock based compensation expense$3,504 $2,287 $9,810 $5,857