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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 26, 2020
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, gross, as of December 30, 2017 |  | $ | 172,482 |  |  | $ | 17,438 |  |  | $ | 189,920 |
Foreign currency translation |  | — |  |  | (706) |  |  | (706) |
Goodwill, gross, as of December 29, 2018 |  | 172,482 |  |  | 16,732 |  |  | 189,214 |
Addition - FRT acquisition |  | — |  |  | 10,148 |  |  | 10,148 |
Foreign currency translation |  | — |  |  | (166) |  |  | (166) |
Goodwill, gross, 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, gross, as of December 26, 2020 |  | $ | 178,072 |  |  | $ | 34,689 |  |  | $ | 212,761 |
We have not recorded any goodwill impairments as of December 26, 2020. Intangible Assets Intangible assets were as follows (in thousands):
|  | December 26, 2020 |  | December 28, 2019
Other Intangible Assets |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Existing developed technologies |  | $ | 176,265 |  |  | $ | 137,754 |  |  | $ | 38,511 |  |  | $ | 154,951 |  |  | $ | 116,138 |  |  | $ | 38,813 |
Trade name |  | 8,162 |  |  | 7,363 |  |  | 799 |  |  | 7,816 |  |  | 6,976 |  |  | 840 |
Customer relationships |  | 52,488 |  |  | 33,378 |  |  | 19,110 |  |  | 44,229 |  |  | 27,057 |  |  | 17,172 |
Backlog |  | 2,227 |  |  | 1,900 |  |  | 327 |  |  | 1,676 |  |  | 891 |  |  | 785 |
In-process research and development |  | 400 |  |  | — |  |  | 400 |  |  | — |  |  | — |  |  | — |
|  | $ | 239,542 |  |  | $ | 180,395 |  |  | $ | 59,147 |  |  | $ | 208,672 |  |  | $ | 151,062 |  |  | $ | 57,610 |
Amortization expense was included in our Consolidated Statements of Income as follows (in thousands):
|  | Fiscal Year Ended
|  | December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Cost of revenues |  | $ | 21,609 |  |  | $ | 20,036 |  |  | $ | 20,530 |
Selling, general and administrative |  | 6,382 |  |  | 7,636 |  |  | 8,843 |
|  | $ | 27,991 |  |  | $ | 27,672 |  |  | $ | 29,373 |
The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands):
Fiscal Year |  | Amount
2021 |  | $ | 20,207 |
2022 |  | 10,594 |
2023 |  | 8,364 |
2024 |  | 5,951 |
2025 |  | 4,398 |
Thereafter |  | 9,233 |
Total |  | $ | 58,747 |
We did not record any impairment of intangible assets in fiscal 2020, 2019 and 2018.

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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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