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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Details of income taxes
The following table provides details of income taxes for the three and six months ended June 30, 2017 and 2016 (in thousands, except percentages):
 
 
Three months ended
 
Six months ended
 
 
June 30,
 
June 30,
 
 
2017
 
2016
 
2017
 
2016
Loss before provision for income taxes
 
$
(2,063
)
 
$
(1,987
)
 
$
(3,058
)
 
$
(5,822
)
Provision for income taxes
 
34

 
36

 
80

 
97

Effective tax rate
 
(2
)%
 
(2
)%
 
(3
)%
 
(2
)%