Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Foreign tax credit carryforward	$ 4,817	$ 2,918
Inventory	17,777	28,181
Net operating losses	18,991	4,899
Allowance for doubtful accounts	358	1,729
Reserve for accrued liabilities	2,732	3,357
Stock options	2,782	3,908
Unrealized gain/loss	1,862
Other	867	1,003
Total deferred tax assets	50,186	45,995
Valuation allowance	(34,464)	(31,833)
Deferred tax liabilities:
Property, plant and equipment	(5,757)	(6,601)
Goodwill & Intangibles	(2,092)	(881)
Deferred revenue	(1,830)
Other	(1,257)	(1,151)
Total deferred tax liability	(10,936)	(8,633)
Net deferred tax asset	$ 4,786	$ 5,529