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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Taxes        
Effective tax rate 0.00% 0.00% 0.00% 0.00%
Income tax benefit (expense) $ 0 $ 0 $ 0 $ 0