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Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jul. 01, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Changes in Stockholders' Equity and Accumulated other Comprehensive Loss
(In thousands)
Common
stock
 
Additional Paid-in
 capital
 
Accumulated
deficit
 
Accumulated
other
comprehensive
loss
 
Total
Balances, December 31, 2016
$
1,216

 
$
680,315

 
$
(406,945
)
 
$
(4,156
)
 
$
270,430

Net loss for the six months ended July 1, 2017
—

 
—

 
(20,297
)
 
—

 
(20,297
)
Unrealized loss related to marketable securities, net of tax
—

 
—

 
—

 
(71
)
 
(71
)
Recognized loss on redemption of marketable securities, previously unrealized
—

 
—

 
—

 
200

 
200

Translation adjustments, net of tax
—

 
—

 
—

 
950

 
950

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax
11

 
1,172

 
—

 
—

 
1,183

Stock-based compensation expense related to stock options, ESPP and RSUs
—

 
6,772

 
—

 
—

 
6,772

Defined benefit pension, net of actuarial losses
—

 
—

 
—

 
(47
)
 
(47
)
Accounting method transition adjustment
—

 
—

 
(355
)
 
—

 
(355
)
Balances, July 1, 2017
$
1,227

 
$
688,259

 
$
(427,597
)
 
$
(3,124
)
 
$
258,765