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Balance Sheet Components (Schedule of Intangibles, Net) (Details) - USD ($)
$ in Thousands
Jun. 27, 2021
Dec. 31, 2020
Intangible Assets [Line Items]    
Gross $ 126,944 $ 126,944
Accumulated Amortization (124,760) (123,045)
Net 2,184 3,899
Technology    
Intangible Assets [Line Items]    
Gross 59,799 59,799
Accumulated Amortization (58,049) (57,835)
Net 1,750 1,964
Customer contracts and relationships    
Intangible Assets [Line Items]    
Gross 56,800 56,800
Accumulated Amortization (56,800) (55,534)
Net 0 1,266
Other    
Intangible Assets [Line Items]    
Gross 10,345 10,345
Accumulated Amortization (9,911) (9,676)
Net $ 434 $ 669