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Income Taxes (Tables)
 9 Months Ended
Sep. 28, 2018
Income Tax Disclosure [Abstract]  
Schedule of income before income tax
The Company reported the following operating results for the periods presented (in thousands):
 
Three months ended
 
Nine months ended
 
September 28,
2018
 
September 29,
2017
 
September 28,
2018
 
September 29,
2017
Loss before income taxes
$
(6,888
)
 
$
(17,498
)
 
$
(21,526
)
 
$
(72,678
)
Provision for (benefit from) income taxes
870

 
(1,915
)
 
2,839

 
(1,568
)
Effective income tax rate
(12.6
)%
 
10.9
%

(13.2
)%

2.2
%