Description of the Company and Summary of Significant Accounting Policies - Summary of Inventory Reserve Activity (Detail) - Inventory Valuation Reserve [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Balance at beginning of year	$ 1,759	$ 1,510
Charged to expense	945	679
Write-offs	(364)	(430)
Balance at end of year	$ 2,340	$ 1,759