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Share based compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Allocation of Share Based Compensation Expense
The following table shows the allocation of share-based compensation between research and development and selling, general and administrative costs (in thousands):
December 31,
20232022
Research and development$4,228 $5,420 
Selling, general and administrative
14,784 8,701 
Total share-based compensation
$19,012 $14,121 
Share Option Activity
The following table shows share option activity and includes the options outstanding from all three plans:
Number of share options
Weighted average exercise price (1)
Weighted average remaining contractual term (years)Aggregate intrinsic value (thousands)
Outstanding at January 1, 2022
12,695,200 $1.38 6.5
Granted9,024,000 0.90 
Forfeited(620,016)1.04 
Exercised(1,822,688)0.75 
Outstanding at December 31, 2022
19,276,496 $1.22 7.2$39,412 
Granted7,376,000 2.46 
Forfeited(464,680)0.89 
Expired(240,000)3.07 
Exercised(1,258,192)1.55 
Outstanding at December 31, 2023
24,689,624 $1.56 7.4$24,022 
Exercisable at December 31, 2023
12,904,640 $1.30 5.8$15,574 
(1) The exercise prices relate to the equivalent price for an ordinary share, calculated as one eighth of the ADS price.
The following summarizes the aggregate intrinsic value and cash receipts related to stock option exercise activity for the years ended December 31:
($ in thousands)
20232022
Aggregate intrinsic value of stock options exercised$1,861 $2,413 
Cash receipts from stock options exercised$1,949 $1,372 
Schedule of Weighted-Average Assumptions
A summary of the weighted-average assumptions applicable to the share options granted in the applicable years is as follows:
December 31,
20232022
Risk-free interest rate
3.40% - 4.69%
2.09% - 4.20%
Expected lives, years
5-7
5-7
Expected volatility
80.64% - 87.26%
82.50% - 84.27%
Expected dividend yield— %— %
Grant date fair value (per share)
$1.69 - $3.27
$0.34 - $1.33
Restricted Stock Unit Activity
The following table shows RSU activity:
Number of RSUsWeighted average grant date fair valueWeighted average remaining contractual term (years)
Outstanding at January 1, 2022
38,347,352 $0.97 1.2
Granted12,877,864 1.07 
Forfeited(1,006,264)1.03 
Vested (15,676,608)0.96 
Outstanding at December 31, 2022
34,542,344 $1.01 1.2
Granted3,596,872 1.66 
Forfeited(303,648)1.10 
Vested(18,332,944)0.99 
Outstanding at December 31, 2023
19,502,624 $1.14 1.2
Summary of the Company’s PRSU Activity
A summary of the Company’s PRSU activity for the year ended December 31, 2023 is as follows:
Number of PRSUsWeighted average grant date fair value
Aggregate Intrinsic Value (thousands)
Outstanding at January 1, 2023
— $— 
Granted10,790,144 1.66 
Forfeited(60,000)1.66 
Outstanding at December 31, 2023
10,730,144 $1.66 $26,665