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, 2021
Dec. 31, 2020
Dec. 31, 2019
United States:      
Federal $ 791 $ 162 $ 242
Total current tax expense 791 162 242
United States:      
Total income tax expense $ 791 $ 162 $ 242