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Certain Balance Sheet Components Certain Balance Sheet Components - Narratives (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jul. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Sep. 26, 2016
Condensed Financial Statements, Captions [Line Items]        
Income Taxes Receivable, Current [1]   $ 6,609 $ 5,895  
TVN [Member]        
Condensed Financial Statements, Captions [Line Items]        
Proceeds from Income Tax Refunds $ 5,800 6,400    
Research Tax Credit Carryforward [Member] | TVN [Member]        
Condensed Financial Statements, Captions [Line Items]        
Income Taxes Receivable, Noncurrent   28,500    
Other Noncurrent Assets [Member] | Research Tax Credit Carryforward [Member] | TVN [Member]        
Condensed Financial Statements, Captions [Line Items]        
Income Taxes Receivable, Noncurrent   21,900    
Prepaid Expenses and Other Current Assets [Member]        
Condensed Financial Statements, Captions [Line Items]        
Prepaid Warrants Incentive   1,000    
Comcast Product Supply Agreement [Member]        
Condensed Financial Statements, Captions [Line Items]        
Warrants and Rights Outstanding       $ 1,600
Property Lease Guarantee [Member] | Other Noncurrent Assets [Member] | TVN [Member]        
Condensed Financial Statements, Captions [Line Items]        
Restricted Cash and Cash Equivalents   $ 1,200    
[1] The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) 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 and in the year ended December 31, 2017 and 2016, the French government approved the 2013 and 2012 claims and refunded $6.4 million and $5.8 million to the TVN French Subsidiary, respectively. The remaining R&D tax credit receivables at December 31, 2017 were approximately $28.5 million and are expected to be recoverable from 2018 through 2021 with $6.6 million reported under “Prepaid and other Current Assets” and $21.9 million reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.