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Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 25, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill by Reportable Segments
Goodwill by reportable segment was as follows (in thousands):
Probe CardsSystemsTotal
Goodwill, gross, as of December 28, 2019$172,482 $26,714 $199,196 
Addition - FRT GmbH Acquisition— 975 975 
Addition - Baldwin Park Acquisition5,590 — 5,590 
Addition - HPD Acquisition— 4,654 4,654 
Foreign currency translation— 2,346 2,346 
Goodwill, gross, as of December 26, 2020178,072 34,689 212,761 
Addition - Baldwin Park Acquisition352 — 352 
Addition - HPD Acquisition— 1,254 1,254 
Foreign currency translation— (1,074)(1,074)
Goodwill, gross, as of September 25, 2021$178,424 $34,869 $213,293 
Schedule of Intangible Assets
Intangible assets were as follows (in thousands):
September 25, 2021December 26, 2020
Intangible Assets GrossAccumulated
Amortization
NetGrossAccumulated
Amortization
Net
Developed technologies $173,160 $148,518 $24,642 $176,265 $137,754 $38,511 
Customer relationships51,514 37,885 13,629 52,488 33,378 19,110 
Trade names8,110 7,586 524 8,162 7,363 799 
Order backlog1,958 1,958 — 2,227 1,900 327 
In-process research and development400 — 400 400 — 400 
$235,142 $195,947 $39,195 $239,542 $180,395 $59,147 
Schedule of Amortization Expense
Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands):
 Three Months EndedNine Months Ended
 September 25,
2021
September 26,
2020
September 25,
2021
September 26,
2020
Cost of revenues$858 $4,985 $11,453 $15,661 
Selling, general and administrative1,604 1,547 4,909 4,588 
$2,462 $6,532 $16,362 $20,249 
Schedule of Estimated Amortization of Intangible Assets
The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands):
Fiscal YearAmount
Remainder of 2021$2,401 
20229,592 
20237,224 
20244,611 
20254,351 
Thereafter10,616 
$38,795