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Inventory (Tables)
3 Months Ended
Mar. 30, 2018
Inventory Disclosure [Abstract]  
Inventory
Inventory consisted of the following (in thousands):
 
March 31,
2018
 
December 31, 2017
Raw materials
$
1,937

 
$
498

Work in process
3,726

 
3,997

Finished goods
2,977

 
2,854

Total
$
8,640

 
$
7,349

 
 
 
 
Balance Sheet classification:
 
 
 
Inventory
$
7,563

 
$
6,657

Other long-term assets
1,077

 
692

Total
$
8,640

 
$
7,349