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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective income tax rate 0.00% 0.00% 0.00% 0.00%  
Federal tax rate (as a percent) 21.00%   21.00%    
Unrecognized tax benefits $ 0   $ 0   $ 0