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Warranty (Tables)
 9 Months Ended
Sep. 24, 2016
Product Warranties Disclosures [Abstract]  
Reconciliation of Changes in Warranty Liability
A reconciliation of the changes in our warranty liability for the nine months ended September 24, 2016 and September 26, 2015, respectively, is as follows (in thousands):
 
September 24,
2016
 
September 26,
2015
Balance at beginning of period
$
1,116

 
$
1,592

Warranty reserve from acquisition-Cascade Microtech
795

 
—

   Accruals
3,106

 
1,855

   Settlements
(2,730
)
 
(2,284
)
Balance at the end of period
$
2,287

 
$
1,163