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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 25, 2020 | Dec. 31, 2019
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2020 (remaining three months) | $ 754 |
2021 | 502 |
Total future amortization expense | 1,256 | $ 4,461
Cost of Revenue [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2020 (remaining three months) | 0 |
2021 | 0 |
Total future amortization expense | 0 |
Operating Expense [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2020 (remaining three months) | 754 |
2021 | 502 |
Total future amortization expense | $ 1,256 |

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