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Balance Sheet Components - Other Long Term Assets (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
French R&D tax credits receivable $ 15,131 $ 19,249
Deferred tax assets 8,500 8,695
Equity investment 3,593 3,593
Other 12,248 6,840
Other Assets, Noncurrent $ 39,472 $ 38,377