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Warranty (Tables)
 6 Months Ended
Jun. 27, 2020
Guarantees [Abstract]  
Schedule of Product Warranty Liability
The following table displays the activity in the warranty provision account for the three and six months ended June 27, 2020 and June 29, 2019:
 
Three Months Ended
   
Six Months Ended
 
 
June 27,
2020
 
  
June 29,
2019
 
  
June 27,
2020
 
  
June 29,
2019
 
 
(In thousands)
 
Opening balance
  $
725
    $
1,297
    $
1,022
    $
997
 
Expenditures incurred under warranties
   
(189
 )    
(257
 )    
(308
 )    
(424
 )
Accruals for product warranties issued during the reporting period
   
135
     
78
     
159
     
402
 
Adjustments to previously existing warranty accruals
   
(9
 )    
(170
 )    
(211
 )    
(27
 )
                                 
Closing balance
  $
662
    $
948
    $
662
    $
948
 
                                 
The following table displays the balance sheet classification of the warranty provision account at June 27, 2020 and at December 28, 2019.
 
June 27,
 
  
December 28,
 
 
2020
 
  
2019
 
 
(In thousands)
 
Other accrued liabilities
  $
487
    $
846
 
Other long-term liabilities
   
175
     
176
 
                 
Total warranty provision
  $
662
    $
1,022