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Balance Sheet Components - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Remaining 2019 $ 2,599  
2020 6,835  
2021 5,101  
2022 1,552  
2023 597  
Thereafter 835  
Net 17,519 $ 23,620
Cost of revenue    
Finite-Lived Intangible Assets [Line Items]    
Remaining 2019 2,392  
2020 6,192  
2021 4,504  
2022 955  
2023 0  
Thereafter 0  
Net 14,043  
Operating expenses    
Finite-Lived Intangible Assets [Line Items]    
Remaining 2019 207  
2020 643  
2021 597  
2022 597  
2023 597  
Thereafter 835  
Net $ 3,476