Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Net current deferred tax assets:
Inventory	$ 20,816	$ 21,531
Net operating losses	5,380	3,019
Allowance for doubtful accounts	1,200	1,311
Reserve for accrued liabilities	3,177	840
Stock options	3,553	6,052
Other	1,811	867
Net current deferred tax assets	35,937	33,620
Valuation allowance	(26,445)	(3,071)
Net non-current deferred tax liability:
Property, plant and equipment	(2,618)	(7,899)
Goodwill & Intangibles	(4,161)	(1,653)
Other	(781)	1,699
Net non-current deferred tax liabilities	(7,560)	(7,853)
Net deferred tax asset	$ 1,932	$ 22,696