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Expenses by nature - Employee-related expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee-related expenses      
Wages and salaries $ 63,704 $ 53,078 $ 40,919
Share-based compensation expenses 33,881 25,635 21,831
Social security costs 5,179 4,496 4,068
Health insurance 4,148 3,161 2,271
Contractor expenses 3,959 3,170 2,423
Other employee expenses 6,365 4,570 2,635
Pension costs - defined contribution plans 2,667 2,051 1,779
Total $ 119,903 $ 96,161 $ 75,926