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Income Taxes - Tax Cuts and Jobs Act of 2017 (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2018
Jun. 30, 2019
Federal statutory income tax rate 21.00% 35.00%    
Income tax related to remeasurement of deferred tax assets due to change in tax law     $ 0  
Reduction in deferred tax assets as remeasured under Tax Cuts and Jobs Act of 2017     26,600,000  
Reduction in valuation allowance resulting from remeasurement of deferred tax assets under Tax Cuts and Jobs Act of 2017     $ 26,600,000  
Forecast        
GILTI income       $ 0
GILTI deductions       $ 0