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Income Taxes - Principal Components of Current and Non-current Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Inventory	$ 7,144	$ 6,609
Accrued expenses	2,330	2,850
Investments		1,122
Deferred compensation	5,660	4,779
Stock-based compensation	2,451	3,069
Uncertain tax positions related to state taxes and related interest	241	326
Pensions	7,074	5,538
Foreign losses	2,925	3,097
State losses and credit carry-forwards	3,995	8,164
Federal loss and research carry-forwards	12,171	17,495
Lease liabilities	2,496
Capitalized research and development expenditures	22,230
Valuation allowance	(48,616)	(5,816)
Total Deferred Tax Assets	20,101	47,233
Property, plant and equipment	(2,815)	(3,515)
Intellectual property	(5,337)	(6,531)
Right of use lease assets	(2,496)
Investments	(1,892)
Total Deferred Tax Liabilities	(12,540)	(10,046)
Net Deferred Tax Assets	$ 7,561	$ 37,187

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