Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued sales incentives	$ 92,087	$ 126,400
Accrued revenue reserve from returns	74,144	104,001
Product warranty	44,904	45,605
Accrued manufacturing expense and freight	36,952	21,357
Accrued sales and marketing	29,725	18,171
Accrued co-op advertising and marketing development funds	27,783	30,435
Accrued research and development	16,521	8,783
Sales taxes and VAT payable	14,108	20,121
Employee-related liabilities	13,513	33,916
Inventory received but not billed	4,397	6,373
Accrued legal settlements and fees	3,375	2,821
Finance lease liabilities	464	0
Derivative liabilities	9	549
Other	7,830	18,702
Accrued liabilities	$ 365,812	$ 437,234