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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 25, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill Goodwill by reportable segment was as follows (in thousands):
|  | Probe Cards |  | Systems |  | Total
Goodwill, as of December 28, 2019 |  | $ | 172,482 |  |  | $ | 26,714 |  |  | $ | 199,196 |
Addition - FRT acquisition |  | — |  |  | 975 |  |  | 975 |
Addition - Baldwin Park acquisition |  | 5,590 |  |  | — |  |  | 5,590 |
Addition - HPD acquisition |  | — |  |  | 4,654 |  |  | 4,654 |
Foreign currency translation |  | — |  |  | 2,346 |  |  | 2,346 |
Goodwill, as of December 26, 2020 |  | 178,072 |  |  | 34,689 |  |  | 212,761 |
Addition - Baldwin Park acquisition |  | 352 |  |  | — |  |  | 352 |
Addition - HPD acquisition |  | — |  |  | 1,254 |  |  | 1,254 |
Foreign currency translation |  | — |  |  | (2,068) |  |  | (2,068) |
Goodwill, as of December 25, 2021 |  | $ | 178,424 |  |  | $ | 33,875 |  |  | $ | 212,299 |
Intangible Assets Intangible assets were as follows (in thousands):
|  | December 25, 2021 |  | December 26, 2020
Other Intangible Assets |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Existing developed technologies |  | $ | 172,259 |  |  | $ | 148,784 |  |  | $ | 23,475 |  |  | $ | 176,265 |  |  | $ | 137,754 |  |  | $ | 38,511 |
Trade name |  | 8,054 |  |  | 7,603 |  |  | 451 |  |  | 8,162 |  |  | 7,363 |  |  | 799 |
Customer relationships |  | 51,270 |  |  | 39,254 |  |  | 12,016 |  |  | 52,488 |  |  | 33,378 |  |  | 19,110 |
Backlog |  | 1,896 |  |  | 1,896 |  |  | — |  |  | 2,227 |  |  | 1,900 |  |  | 327 |
In-process research and development |  | 400 |  |  | — |  |  | 400 |  |  | 400 |  |  | — |  |  | 400 |
|  | $ | 233,879 |  |  | $ | 197,537 |  |  | $ | 36,342 |  |  | $ | 239,542 |  |  | $ | 180,395 |  |  | $ | 59,147 |
Amortization expense was included in our Consolidated Statements of Income as follows (in thousands):
|  | Fiscal Year Ended
|  | December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Cost of revenues |  | $ | 12,269 |  |  | $ | 21,609 |  |  | $ | 20,036 |
Selling, general and administrative |  | 6,478 |  |  | 6,382 |  |  | 7,636 |
|  | $ | 18,747 |  |  | $ | 27,991 |  |  | $ | 27,672 |
The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands):
Fiscal Year |  | Amount
2022 |  | $ | 9,488 |
2023 |  | 7,133 |
2024 |  | 4,533 |
2025 |  | 4,277 |
2026 |  | 3,241 |
Thereafter |  | 7,270 |
Total |  | $ | 35,942 |
We did not record any impairment of intangible assets in fiscal 2021, 2020 and 2019.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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