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Restructuring Charges (Tables)
9 Months Ended
Sep. 25, 2021
Restructuring and Related Activities [Abstract]  
Restructuring Costs by Reportable Segment
Restructuring charges by reportable segment included in our Condensed Consolidated Statements of Income were as follows (in thousands):

Three Months EndedNine Months Ended
September 25, 2021September 25, 2021
Probe CardsSystemsTotalProbe CardsSystemsTotal
Cost of revenues$4,070 $252 $4,322 $4,070 $420 $4,490 
Research and development— 289 289 — 694 694 
Selling, general and administrative— 22 22 — 83 83 
$4,070 $563 $4,633 $4,070 $1,197 $5,267 
Schedule of Restructuring Accrual Activity
Changes to the restructuring accrual in the nine months ended September 25, 2021 were as follows (in thousands):
Employee
Severance
and Benefits
Inventory
Impairments
Property and Equipment ImpairmentsContract Termination CostsTotal
December 26, 2020$— $— $— $— $— 
Restructuring charges875 1,322 270 2,800 5,267 
Non-cash settlement— (1,322)(270)— (1,592)
September 25, 2021$875 $— $— $2,800 $3,675