Balance Sheet Components Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2019	Dec. 31, 2018
French R&D tax credits receivable(1)	[1]	$ 7,159	$ 7,305
French R&D tax credits receivable, noncurrent		20,200	$ 19,249
TVN [Member]
R&D tax credits receivable expected to be recoverable from 2019 through 2022		$ 27,400
TVN [Member] | Research Tax Credit Carryforward [Member]
The number of years R&D tax credits can be used to offset against income tax payable after incurred		4 years
R&D tax credits receivable expected to be recoverable from 2019 through 2022		$ 27,400
Prepaid Expenses and Other Current Assets [Member] | TVN [Member] | Research Tax Credit Carryforward [Member]
French R&D tax credits receivable(1)		7,200
Other Noncurrent Assets [Member] | TVN [Member] | Research Tax Credit Carryforward [Member]
French R&D tax credits receivable, noncurrent		$ 20,200

[1] The Company’s TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government. The R&D tax credits receivable at March 29, 2019 were approximately $27.4 million and are expected to be recoverable from 2019 through 2022 with $7.2 million reported as a component of “Prepaid expenses and other current assets” and $20.2 million reported as a component of “Other long-term assets” on the Company’s Condensed Consolidated Balance Sheets.