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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2019
Income Taxes [Abstract]  
Income Taxes
Income (loss) before income taxes is comprised of the following:

  
Three Months Ended
March 31,
 
  
2019
  
2018
 
Income tax provision
 
$
(2
)
 
$
(5
)
Loss before income taxes
 
$
(28
)
 
$
(36
)
Effective tax rate
  
(7
)%
  
(14
)%