Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Net current deferred tax assets:
Inventory	$ 11,674	$ 11,062
Inventory reserve	9,857	8,926
Allowance for doubtful accounts	1,311	1,578
Reserve for accrued liabilities	840	1,205
Other	815	1,842
Net current deferred tax assets	24,497	24,613
Net non-current deferred tax liability:
Property, plant and equipment	(9,552)	(10,583)
Stock options	6,052	6,898
Other	1,699	708
Net non-current deferred tax liabilities	(1,801)	(2,977)
Net deferred tax asset	$ 22,696	$ 21,636