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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current Expense (Benefit):    
Federal $ 0 $ 0
State 0 0
Current Income Tax Expense 0 0
Deferred Expense (Benefit):    
Federal 0 0
State 0 0
Deferred Income Tax Expense 0 0
Total Tax (Expense) / Benefit $ 0 $ 0