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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
Changes in the goodwill balance were as follows (in thousands):
 
December 31,
2016
 
January 2,
2016
Goodwill, beginning of period
$
20,394

 
$
20,979

Foreign currency translation adjustment
(614
)
 
(585
)
Goodwill, end of period
$
19,780

 
$
20,394