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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Summary of the provision for (benefit from) income taxes
The components of the provision for income taxes are shown below for the periods presented (in thousands):

 
Three months ended
June 30,
 
Six months ended
June 30,
 
2017
 
2016
 
2017
 
2016
Current:
 
 
 
 
 
 
 
U.S. federal
$

 
$

 
$

 
$

State

 

 

 
11

Provision for income taxes
$

 
$

 
$

 
$
11