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Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Sep. 25, 2020 | Dec. 31, 2019
--- | --- | ---
Receivables [Abstract] |  |
Accounts receivable | $ 84,240 | $ 91,513
Less: allowances for doubtful accounts and sales returns | (2,887) | (3,013)
Accounts Receivable, after Allowance for Credit Loss, Current | $ 81,353 | $ 88,500

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