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Goodwill (Tables)
 6 Months Ended
Jul. 02, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
The changes in the carrying value of goodwill were as follows (in thousands):
 
 
Amount
Balance as of December 31, 2016
 
$
95,280

Acquisition of ViDi Systems S.A.
 
18,333

Acquisition of GVi Ventures, Inc.
 
1,476

Balance as of July 2, 2017
 
$
115,089