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Operating Expenses (Tables)
12 Months Ended
Dec. 31, 2022
Operating Expenses [Abstract]  
Disclosure of total operating expense
Total operating expenses were as follows:
For the years ending December 31,
2022
$000s
2021
$000s
2020
$000s
General and administrative60,991 57,199 49,440 
Research and development152,433 110,471 81,859 
Total operating expenses213,425 167,671 131,299 
Disclosure of information about employees
The average number of persons employed by the Group during the year, analyzed by category, was as follows:
For the years ending December 31,
2022
2021
2020
General and administrative57 52 43 
Research and development144 119 95 
Total201 171 138 
Disclosure of payroll costs
The aggregate payroll costs of these persons were as follows:
2022
$000s
2021
$000s
2020
$000s
For the years ending December 31,
General and administrative25,322 26,438 22,943 
Research and development36,321 28,950 20,674 
Total61,643 55,388 43,616 
Disclosure of other operating expense
Detailed operating expenses were as follows:
2022
$000s
2021
$000s
2020
$000s
For the years ending December 31,
Salaries and wages41,750 36,792 29,403 
Healthcare benefits2,908 2,563 1,866 
Payroll taxes2,286 2,084 1,629 
Share-based payments14,699 13,950 10,718 
Total payroll costs61,643 55,388 43,616 
Other general and administrative expenses35,669 30,761 26,497 
Other research and development expenses116,113 81,521 61,186 
Total other operating expenses151,782 112,282 87,683 
Total operating expenses213,425 167,671 131,299 
Disclosure of auditors' remuneration
Auditor's remuneration:
For the years ending December 31,
2022
$000s
2021
$000s
2020
$000s
Audit of these financial statements1,716 1,183 1,145 
Audit of the financial statements of subsidiaries132 312 291 
Audit of the financial statements of associate**814 571 350 
Audit-related assurance services*
1,157 1,868 490 
Non-audit related services — 173 
Total3,819 3,934 2,449 
*    2021 – $468.2 thousand represents prepaid expenses related to an expected initial public offering of a subsidiary.
**    Audit fees of $720.0 thousand, $500.0 thousand and $350.0 thousand in respect of financial statements of associates for the years ended December 31, 2022, 2021, and 2020 respectively, are not included within the consolidated financial statements. Fees related to the audit of the financial statements of associates have been disclosed in respect of 2022, 2021, and 2020 as these fees went towards supporting the audit opinion on the Group accounts. Such amounts were not previously disclosed in the 2020 financial statements.

Please refer to Note 8 for further disclosures related to share-based payments and Note 24 for management’s remuneration disclosures.