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Inventories
 6 Months Ended
Jul. 02, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following (in thousands):
 
July 2, 2017
 
December 31, 2016
Raw materials
$
23,197

 
$
18,224

Work-in-process
6,970

 
2,760

Finished goods
6,324

 
6,000

 
$
36,491

 
$
26,984