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The Nature of Expenses - Employee benefits expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
The Nature of Expenses      
Salary $ 126,976 $ 88,149 $ 80,617
Labor and health insurance 7,232 5,805 5,668
Pension 5,993 4,536 5,246
Others 6,608 4,867 3,586
Total compensation recognized in income $ 146,809 $ 103,357 $ 95,117