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Goodwill and Other Intangible Assets | 12 Months Ended
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Jan. 02, 2021
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 9. Goodwill and Other Intangible Assets Goodwill The following summarizes the activity in goodwill for the years ended January 2, 2021 and December 28, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | January 2, | ​ | December 28,
​ |  | 2021 |  | 2019
Beginning balance |  | $ | 398,402 |  | $ | 397,344
Additions due to business combinations | ​ |  | 233,530 | ​ |  | 1,058
Ending balance | ​ | $ | 631,932 | ​ | $ | 398,402
​ ​ Other Intangible Assets The gross carrying amount and accumulated amortization of other intangible assets are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted-Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortization | ​ | January 2, 2021 | ​ | December 28, 2019
​ | ​ | Period | ​ | Gross | ​ | Accumulated | ​ | Gross | ​ | Accumulated
​ |  | (Years) |  | Amount |  | Amortization |  | Amount |  | Amortization
Subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Developed technology |  | 8 | ​ | $ | 261,939 | ​ | $ | (125,435) | ​ | $ | 219,695 | ​ | $ | (111,634)
Customer relationships |  | 5 | ​ |  | 43,245 | ​ |  | (31,877) | ​ |  | 40,795 | ​ |  | (22,742)
Trademarks |  | 5 | ​ |  | 12,771 | ​ |  | (6,312) | ​ |  | 12,310 | ​ |  | (4,145)
​ | ​ | 8 | ​ | ​ | 317,955 | ​ | ​ | (163,624) | ​ | ​ | 272,800 | ​ | ​ | (138,521)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Not subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
In-process research and development | ​ | Not amortized | ​ | ​ | 11,753 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total intangible assets | ​ | ​ | ​ | $ | 329,708 | ​ | $ | (163,624) | ​ | $ | 272,800 | ​ | $ | (138,521)
​ Gross intangible assets increased $76.5 million in fiscal 2020 due to assets acquired from Redpine Signals. This increase was offset by $19.6 million for the removal of fully amortized assets. Amortization expense related to intangible assets for fiscal 2020, 2019 and 2018 was $44.7 million, $39.5 million and $38.0 million, respectively. Research and development expense included intangible asset amortization expense of $33.2 million, $29.5 million and $27.3 million in fiscal 2020, 2019 and 2018, respectively. Selling, general and administrative expense included intangible asset amortization expense of $11.5 million, $10.0 million and $10.7 million in fiscal 2020, 2019 and 2018, respectively. There was no intangible asset amortization expense recorded in cost of revenues in any of the periods presented. The estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years is as follows (in thousands): ​
​ | ​ | ​ | ​
Fiscal Year |  | ​ |
2021 | ​ | $ | 44,358
2022 | ​ | ​ | 33,046
2023 | ​ | ​ | 24,324
2024 | ​ | ​ | 21,864
2025 | ​ | ​ | 12,200
​

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- Definition The entire disclosure for goodwill and 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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