Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued sales incentives	$ 156,839	$ 126,400
Sales returns reserve	101,326	104,001
Product warranty	52,403	45,605
Accrued co-op advertising and marketing development funds	40,689	30,435
Employee-related liabilities	37,355	33,916
Accrued manufacturing expense and freight	35,112	21,357
Accrued sales and marketing	26,781	18,171
Sales taxes and VAT payable	19,603	20,121
Accrued research and development	19,232	8,783
Accrued legal settlements and fees	8,854	2,821
Inventory received but not billed	1,669	6,373
Finance lease liabilities	1,384	0
Derivative liabilities	748	549
Other	11,535	18,702
Accrued liabilities	$ 513,530	$ 437,234