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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Provision for Income Taxes The provision for income taxes consisted of the following components (in thousands):
Three Months Ended June 30,
Six Months Ended June 30,
2018201720182017
Current 
Federal $— $— $— $— 
State (45)(42)(42)(39)
Total provision$(45)$(42)$(42)$(39)