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Income Taxes - Reconciliation of tax rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes    
Federal income tax rate (as a percent) 21.00% 21.00%
Expected tax benefit at 21% $ (1,657) $ (1,446)
Change in valuation allowance 1,558 1,325
Other 99 121
Provision for income taxes $ 0 $ 0