Income Taxes - Components of Deferred Tax Asset and Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accounts receivable	$ 132	$ 225
Inventories	164	743
Net operating loss carryforwards	5,339	3,851
Other accrued liabilities	1,053	4,592
Pension	1,482	3,545
Tax Credits	1,735	1,687
Total deferred tax assets	9,905	14,643
Deferred tax liabilities:
Intangible assets	2,073	4,224
Property, plant and equipment	15,691	21,117
Total deferred tax liabilities	17,764	25,341
Valuation allowance	5,709	4,903
Net deferred tax liabilities	$ (13,568)	$ (15,601)