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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Taxes        
Income tax expense $ 0 $ 0 $ 0 $ 0
Uncertain tax positions 0 0 0 0
Interest or penalties recorded $ 0 $ 0 $ 0 $ 0