Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued sales incentives	$ 101,352	$ 126,400
Accrued revenue reserve from returns	75,998	104,001
Product warranty	48,034	45,605
Finance lease liabilities	2,102	0
Sales taxes and VAT payable	12,873	20,121
Accrued manufacturing expense and freight	30,288	21,357
Accrued co-op advertising and marketing development funds	27,605	30,435
Employee-related liabilities	19,196	33,916
Accrued sales and marketing	15,573	18,171
Accrued research and development	12,655	8,783
Inventory received but not billed	4,091	6,373
Accrued legal settlements and fees	2,912	2,821
Derivative liabilities	28	549
Other	11,044	18,702
Accrued liabilities	$ 363,751	$ 437,234