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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2022
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 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 |
Addition - Woburn acquisition |  | — |  |  | 550 |  |  | 550 |
Foreign currency translation |  | — |  |  | (1,405) |  |  | (1,405) |
Goodwill, as of December 31, 2022 |  | $ | 178,424 |  |  | $ | 33,020 |  |  | $ | 211,444 |
Intangible Assets Intangible assets were as follows (in thousands):
|  | December 31, 2022 |  | December 25, 2021
Other Intangible Assets |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Existing developed technologies |  | $ | 171,441 |  |  | $ | 151,212 |  |  | $ | 20,229 |  |  | $ | 172,259 |  |  | $ | 148,784 |  |  | $ | 23,475 |
Trade name |  | 7,972 |  |  | 7,759 |  |  | 213 |  |  | 8,054 |  |  | 7,603 |  |  | 451 |
Customer relationships |  | 50,912 |  |  | 45,003 |  |  | 5,909 |  |  | 51,270 |  |  | 39,254 |  |  | 12,016 |
Backlog |  | — |  |  | — |  |  | — |  |  | 1,896 |  |  | 1,896 |  |  | — |
In-process research and development |  | 400 |  |  | — |  |  | 400 |  |  | 400 |  |  | — |  |  | 400 |
|  | $ | 230,725 |  |  | $ | 203,974 |  |  | $ | 26,751 |  |  | $ | 233,879 |  |  | $ | 197,537 |  |  | $ | 36,342 |
Amortization expense was included in our Consolidated Statements of Income as follows (in thousands):
|  | Fiscal Year Ended
|  | December 31, 2022 |  | December 25, 2021 |  | December 26, 2020
Cost of revenues |  | $ | 3,225 |  |  | $ | 12,269 |  |  | $ | 21,609 |
Selling, general and administrative |  | 6,166 |  |  | 6,478 |  |  | 6,382 |
|  | $ | 9,391 |  |  | $ | 18,747 |  |  | $ | 27,991 |
The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands):
Fiscal Year |  | Amount
2023 |  | $ | 7,166 |
2024 |  | 4,584 |
2025 |  | 4,243 |
2026 |  | 3,155 |
2027 |  | 2,816 |
Thereafter |  | 4,387 |
Total |  | $ | 26,351 |
We did not record any impairment of intangible assets in fiscal 2022, 2021 and 2020.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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