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Other operating income - Other Incentives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other operating income      
Research and development incentives $ 19,502 $ 13,970 $ 10,257
Incentive refund period 5 years    
Payroll tax rebates $ 8,576 $ 12,621 $ 9,095