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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Components of Income Tax Expense
The components of income tax expense for the following periods are as follows (in thousands):
 
For the three months endedFor the six months ended
June 30,June 30,
2019201820192018
Federal$— $— $— $— 
State— — — — 
Tax expense (benefit)$— $— $— $—