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Balance Sheet Components - Other Long Term Assets (Details) - USD ($) $ in Thousands | Sep. 25, 2020 | Dec. 31, 2019
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
French R&D tax credits receivable(3) | [1] | $ 13,345 | $ 15,899
Deferred tax assets |  | 9,876 | 10,575
Equity investment |  | 3,593 | 3,593
Other |  | 9,438 | 11,238
Other Assets, Noncurrent |  | $ 36,252 | $ 41,305
[1] | See “Prepaid expenses and other current assets” for details related to French R&D tax credits receivable.

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