Balance Sheet Components - Warranty Accrual Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 3,148	$ 3,104
Charged to cost of revenues	1,796	1,990
Actual warranty expenditures	(2,306)	(1,946)
Balance at end of period	$ 2,638	$ 3,148