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Summary of Significant Accounting Policies (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]          
Income tax expense (benefit) $ 0 $ 0 $ 0 $ 0  
Uncertain tax positions $ 0   $ 0   $ 0