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Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 25, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 85,694 | $ 85,478
Accumulated Amortization | (84,438) | (81,017)
Total future amortization expense | 1,256 | 4,461
Developed Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 30,657 | 31,707
Accumulated Amortization | (30,657) | (30,757)
Total future amortization expense | $ 0 | 950
Customer relationships/contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 4 months 24 days |
Gross Carrying Amount | $ 44,715 | 44,577
Accumulated Amortization | (43,459) | (41,092)
Total future amortization expense | 1,256 | 3,485
Trademarks and Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 635 | 609
Accumulated Amortization | (635) | (583)
Total future amortization expense | 0 | 26
Maintenance Agreements and Related Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,500 | 5,500
Accumulated Amortization | (5,500) | (5,500)
Total future amortization expense | 0 | 0
Order Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,137 | 3,085
Accumulated Amortization | (3,137) | (3,085)
Total future amortization expense | $ 0 | $ 0

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