Basis of Presentation and Summary of Significant Accounting Policies - Customer Bankruptcy & Non-Monetary Transactions (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Jul. 01, 2017	Sep. 30, 2017	Jul. 01, 2017	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Standard product warranty term				2 years
Bad debt expense				$ 7,805	$ 0
Wynit Distribution [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Unrecognized revenue, net		$ 8,100
Allowance for Doubtful Accounts Receivable		35,800
Unrecoverable inventory		5,500
Accounts receivable for shipments made in the quarter		30,300		30,300
Insurance proceeds receivable, accounts receivable		22,700		22,700
Probably insurance proceeds		26,800		26,800
Insurance proceeds receivable, inventory		4,100		4,100
Charges Offset By Insurance Recorded		9,000
Bad debt expense		7,600
Cost of revenue		1,400
Wynit Distribution [Member] | Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			11.00%
Wynit Distribution [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%
Advertising Barter Transactions [Member]
Concentration Risk [Line Items]
Nonmonetary transaction, gross operating revenue recognized						$ 15,000
Nonmonetary transaction, cost of goods transferred						7,000
Nonmonetary transaction, advertising credit received						13,000
Nonmonetary transaction, cash received						2,000
Nonmonetary transaction, remaining advertising credit		12,700		12,700		$ 13,000
Nonmonetary transaction, advertising credit, expected period of use						4 years
Nonmonetary transaction, advertising credit utilized during the period		$ 0		$ 300