Balance Sheet Components - Schedule of Allowance for Sales Returns (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (21,897)
Ending balance	(27,521)	$ (21,897)
Allowance for Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	(7,335)	(6,907)
Charged to revenue	(15,541)	(17,396)
Utilization of sales return/incentive reserve	16,326	16,968
Ending balance	$ (6,550)	$ (7,335)