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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 27, 2015
Commitments and Contingencies Disclosure [Abstract]  
Summary of Changes in Product Warranty Accrual
The following table summarizes changes in our product warranty accrual for the periods indicated (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 27,
2015
 
September 28,
2014
 
September 27,
2015
 
September 28,
2014
Beginning balance
$
3,466

 
$
2,088

 
$
2,803

 
$
1,786

Warranties issued in the period
416

 
598

 
2,065

 
1,749

Costs to service warranties
(1,128
)
 
(932
)
 
(2,989
)
 
(2,614
)
Warranty accrual adjustments
654

 
507

 
1,529

 
1,340

Ending balance
$
3,408

 
$
2,261

 
$
3,408

 
$
2,261