Balance Sheet Components Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 27, 2019	Dec. 31, 2018
French R&D tax credits receivable, noncurrent	$ 15,131	$ 19,249
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
Other Noncurrent Assets [Member] \| TVN [Member] \| Research Tax Credit Carryforward [Member]
French R&D tax credits receivable, noncurrent	$ 22,300

Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5)(c))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Name:	us-gaap_IncomeTaxesReceivableNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant