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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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