Balance Sheet Components - Other Long Term Assets (Details) - USD ($) $ in Thousands		Sep. 28, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
R&D tax credits receivable		$ 18,104	$ 22,322
Deferred tax assets		9,362	10,462
Equity investment		3,593	3,593
Others(1)	[1]	7,565	6,536
Other Assets, Noncurrent		$ 38,624	$ 42,913

[1] As of December 31, 2017, the Company had approximately $1.2 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. The restriction was subsequently released and accordingly, the amount was reclassified to “Cash and cash equivalents” in the nine months ended September 28, 2018.