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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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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 Cards |  | Systems |  | Total
Goodwill, gross, as of December 28, 2019 |  | $ | 172,482 |  |  | $ | 26,714 |  |  | $ | 199,196 |
Addition - FRT GmbH 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 |
Addition - Baldwin Park Acquisition |  | 352 |  |  | — |  |  | 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, 2021 |  | December 26, 2020
Intangible Assets |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Developed technologies |  | $ | 173,160 |  |  | $ | 148,518 |  |  | $ | 24,642 |  |  | $ | 176,265 |  |  | $ | 137,754 |  |  | $ | 38,511 |
Customer relationships |  | 51,514 |  |  | 37,885 |  |  | 13,629 |  |  | 52,488 |  |  | 33,378 |  |  | 19,110 |
Trade names |  | 8,110 |  |  | 7,586 |  |  | 524 |  |  | 8,162 |  |  | 7,363 |  |  | 799 |
Order backlog |  | 1,958 |  |  | 1,958 |  |  | — |  |  | 2,227 |  |  | 1,900 |  |  | 327 |
In-process research and development |  | 400 |  |  | — |  |  | 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 Ended |  | Nine 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 administrative | 1,604 |  |  | 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 Year |  | Amount
Remainder of 2021 |  | $ | 2,401 |
2022 |  | 9,592 |
2023 |  | 7,224 |
2024 |  | 4,611 |
2025 |  | 4,351 |
Thereafter |  | 10,616 |
|  | $ | 38,795 |

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