Balance Sheet Components - Other Long Term Assets (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
French R&D tax credits receivable	$ 16,303	$ 15,899
Deferred tax assets	10,222	10,575
Equity investment	3,593	3,593
Other	9,757	11,238
Other Assets, Noncurrent	$ 39,875	$ 41,305