Annual report pursuant to Section 13 and 15(d)

Income taxes - Components of Income Tax Expense (Benefit) (Details)

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Income taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
United States:      
Federal $ 2,492 $ 791 $ 162
State and local 5    
Total current tax expense 2,497 791 162
United States:      
Total income tax expense $ 2,497 $ 791 $ 162