Balance Sheet Components (Schedule of Other Accrued Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 01, 2018		Jul. 02, 2017	Jul. 01, 2018		Jul. 02, 2017	Jan. 01, 2018	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Sales and marketing	$ 39,230			$ 39,230				$ 31,613
Warranty obligation	3,487	[1]		3,487	[1]			31,756
Sales returns	26,581	[1]		26,581	[1]			0
Freight	2,704			2,704				3,862
Deferred revenue	6,038			6,038				3,184
Other	18,446			18,446				5,682
Total accrued liabilities	96,486			96,486			$ 89,467	$ 76,097
Reclassified to sales returns upon adoption of ASC 606	$ 0		$ 0	$ 28,713	[2]	$ 0

[1] Upon adoption of ASC 606 on January 1, 2018, warranty reserve balances totaling $28.7 million were reclassified to sales returns as these liabilities are payable to the Company’s customers and settled in cash or by credit on account. Under ASC 606, these amounts are to be accounted for as sales with right of return.

[2] Upon adoption of ASC 606 on January 1, 2018, warranty reserve balances totaling $28.7 million were reclassified to sales returns as these liabilities are payable to the Company’s customers and settled in cash or by credit on account. Under ASC 606, these amounts are to be accounted for as sales with right of return.