Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Pension and other retiree obligations	$ 32	$ 209
Inventory	507	89
Other accruals and reserves	2,856	2,370
Loss and credit carryforwards	14,535	10,932
Interest expense deduction limitation carryforward	2,769	0
Other	0	886
Valuation allowance	(16,367)	(13,061)
Deferred tax assets	4,332	1,425
Deferred tax liabilities:
Intangible assets other than goodwill	(22,443)	(21,753)
Property, plant and equipment	(2,582)	(1,548)
Unrealized foreign currency gains	(2,155)	(1,056)
Other		0
Deferred tax liabilities	(27,232)	(24,357)
Net deferred tax liabilities	$ (22,900)	$ (22,932)