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Balance Sheet Components - Other Long Term Assets (Details) - USD ($)
$ in Thousands
Jun. 26, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
French R&D tax credits receivable $ 17,843 $ 15,899
Deferred tax assets 9,958 10,575
Equity investment 3,593 3,593
Other 9,808 11,238
Other Assets, Noncurrent $ 41,202 $ 41,305