Balance Sheet Components - Standard Product Warranty Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued warranty balance	$ 7,661	$ 8,104	$ 8,707
Accrued warranty, net	11,155	7,058	4,124
Warranty expenditures during period	(7,881)	(7,501)	(4,727)
Accrued warranty balance	$ 10,935	$ 7,661	$ 8,104