Basis of Presentation and Summary of Significant Accounting Policies - Accounting Pronouncements Recently Adopted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by financing activities			$ (4,790)	$ 3,089
Net cash provided by operating activities			$ 1,524	8,718
Best estimated selling price on upgrade rights			$ 0.99
Revenue	$ 393,575	$ 392,522	$ 940,784	1,044,763
Accounts receivable, net	325,964		325,964			$ 406,019
Deferred revenue	27,350		27,350			35,504
Contract with Customer, Liability	32,808		32,808		$ 32,835	42,432
Deferred Revenue	32,808		32,808
Accrued liabilities	386,384		386,384			452,137
Accumulated deficit	(334,440)		(334,440)			(132,112)
Accounting Standards Update 2014-09 [Member] | Accrued liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserves and accruals, returns and allowances	78,500		$ 78,500
Accounting Standards Update 2014-09 [Member] | Accounts Receivable [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserves and accruals, returns and allowances						$ 109,900
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities				25,500
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated selling price			$ 1
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated selling price			$ 3
Subscription-based Premium Services [Member] | Customer Concentration Risk [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage			1.00%
Advertising Barter Transactions [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Nonmonetary transaction, advertising credit utilized during the period			$ 1,100	$ 300
Under ASC 605 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	395,438		941,272
Accounts receivable, net	247,447		247,447
Deferred revenue	33,102		33,102
Accrued liabilities	306,663		306,663
Impact [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	(1,863)		(488)
Accounts receivable, net	78,517		78,517
Deferred revenue	(294)		(294)
Accrued liabilities	79,721		79,721
Three Months Ended Under ASC 605 [Member] | Under ASC 605 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit	(327,952)		(327,952)
Three Month Ended Impact under 606 [Member] | Impact [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit	(6,488)		(6,488)
Nine Months Ended Under ASC 605 [Member] | Under ASC 605 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit	(327,952)		(327,952)
Nine Month Ended Impact under 606 [Member] | Impact [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit	$ (6,488)		$ (6,488)